10 Signs of Infidelity: What They Mean (and Don't Mean) If Your Partner Might Be Cheating | My Growth Counselling

Searching for signs of infidelity usually means something has already shifted. A schedule has changed, a conversation felt off, or there is a feeling you can't name and can't shake. Wondering whether your partner could be cheating is stressful on its own, and most of what you'll find online comes as a checklist that reads like certainty.

I'm Sherriden Brown, a Registered Psychotherapist in Mississauga. I work with couples and individuals recovering from affairs, and I also hear from people who only suspect their partner is seeing someone else and aren't sure what they're seeing. This guide covers 10 common signs of cheating and what each one can and can't tell you, how an emotional affair can look, why going through your partner's phone or accounts usually backfires, and what to do with a suspicion.

Before the list, one point matters more than any item on it. No single sign proves infidelity. Every behaviour below has ordinary explanations, including stress, depression, grief, a new job, or a surprise you aren't meant to know about. No list is telling you that your partner is cheating, and this guide isn't a way to catch anyone. What it can do is help you tell a rough patch from a pattern, and help you decide what to do next. Treat the warning signs here as questions to explore.

What Counts as Infidelity?

Couples define infidelity differently, which is why it helps to know where your own line is. At its core, infidelity is a breach of the commitment two people have made to each other. It can be emotional or physical, or both. An emotional affair is a close bond kept hidden from you with someone outside the relationship, usually without sex. A physical affair involves sexual contact. Some couples also count online relationships, and some count behaviours that other couples wouldn't.

Married couples, common-law couples and people who are dating all carry agreements about this, spoken or unspoken. Many couples have never said out loud what cheating would include, so the question that matters is what the two of you agreed to.

10 Signs Your Partner Might Be Cheating

These are the signs of a cheating partner that people most often describe. After each one I've added what it can and can't mean, because the same behaviour can come from very different places.

1. A new secretiveness around their phone. Taking calls outside, turning the screen face down, changing a passcode, or starting to delete text messages that used to sit there. This could be a sign that your partner is hiding something. It could also be a gift they're planning or a private conversation about their health or family. What matters is whether the secrecy is new and whether calls and texts have become something they guard.
   
   
2. A schedule that stops adding up. More working late, work events that never came up before, trips you hear about at the last minute, or time that's hard to account for. Some people make excuses that sound reasonable once and strange the fifth time. Plenty of jobs have busy seasons. A red flag is when the explanations stay vague or keep changing, or when your partner seems uncomfortable if you ask.
   
   
3. Pulling away emotionally. They seem less interested in your day, stop sharing small things, or feel absent even when you're in the same room. This may be a sign of an affair, and it is also among the least specific signs. Depression, burnout, grief and unresolved conflict all create emotional distance, and some people pull back to avoid getting hurt after a conflict.
   
   
4. A sudden change in appearance. New clothes, a new gym routine or extra attention to grooming, as if they're trying to impress someone. Many people change how they look for themselves. The timing, and any secrecy around it, carries more information than the change does.
   
   
5. A shift in sexual intimacy. A drop in sexual interest, or a sudden change in the sexual relationship, can mean a partner's attention is elsewhere. Physical intimacy also changes with stress, health, medication, sleep and new babies, so on its own it tells you little.
   
   
6. Irritability and picking fights. Some people create distance by finding fault. A partner who is suddenly critical, or who turns small disagreements into arguments, may be avoiding closeness. They may also be overwhelmed by something they haven't told you.
   
   
7. Turning suspicion back on you. A partner who has something to hide may accuse you of cheating when you ask simple questions. Defensiveness can also come from feeling under suspicion, so it tells you more when it shows up out of nowhere than when it follows a tense exchange.
   
   
8. Money that doesn't add up. Unexplained charges, large cash withdrawals, a new card, or reluctance to share statements. Financial secrecy deserves attention in its own right, whatever the cause.
   
   
9. Sudden generosity. Some people feel guilt and overcompensate, so you may notice unexpected gifts or acts of kindness that seem out of proportion, as if they're trying to make up for something. A partner who wants to surprise you with new plans isn't necessarily hiding anything, which is why the pattern matters more than the gesture.
   
   
10. New accounts and hidden devices. New social media accounts, a second phone, apps you haven't seen, or a friendship they keep separate from you. Privacy is normal in a relationship. Concealment that is new and deliberate is what makes this a cause for concern.
    
    

Notice how many of these start with the word new. A partner suddenly changing several habits at once, with explanations that don't hold together, is more telling than any one item on its own.

Why No Single Sign of Cheating Proves Anything

Each of the signs above can point to an affair, and each can mean something else. Stress, depression, grief, health problems and burnout can produce emotional distance, irritability and a drop in desire without anyone else involved. A spouse could also be struggling with something they haven't named, and a partner who withdraws is not necessarily a cheater. It's easier to spot signs of a pattern than to read any one behaviour, so I suggest three questions. Is the change new for your partner? Has it lasted more than a few weeks? Does it come with less closeness between you?

A cluster of changes that lasts says more than a single moment. Even then, treat these as potential signs and as a reason to talk. A sign that your partner is pulling away tells you the relationship needs attention, and it doesn't tell you why.

Signs of an Emotional Affair

An emotional affair can be harder to spot because the secrecy is about feelings, and there may be no unexplained absence at all. You might notice that your partner is sharing things with someone else that used to be shared with you. A partner may begin mentioning a coworker or friend constantly, or stop mentioning them altogether. Your partner becomes protective of the friendship, spends long stretches messaging, or talks about feeling understood by someone else in a way they don't feel with you.

If your partner is suddenly spending time with someone you're shut out of, and the friendship has started to look like a relationship with someone else, that is worth raising. In my work, the hurt from an emotional affair can run as deep as the hurt from a physical one, because what was shared was closeness.

Is Your Gut Feeling Telling You Something?

Many people say the first sign was a sense that something was off before they could point to anything. The feeling that something is amiss deserves to be taken seriously, because you know your partner's patterns better than anyone does. It isn't evidence, though. Anxiety, earlier betrayals and trust issues from past relationships can make ordinary behaviour look suspicious, and a hunch can be right or wrong. If your partner's explanations make you doubt your own memory or judgment, that is worth saying out loud, to them or to a counsellor.

You can trust your gut enough to raise the question, and hold it loosely enough to hear the answer.

Should You Check Their Phone, Password or Email Account?

The urge is understandable, since you want to protect yourself, and I encourage you to resist it. Going through a partner's phone, guessing a password, logging into their email or tracking everywhere they go tends to deepen distrust. You can end up with something you can't un-see and still can't interpret. Even if you find evidence of their infidelity, how you found it can complicate the conversation that follows.

There can also be legal risk. In Canada, getting into someone else's computer or accounts without their permission can be a criminal offence under the Criminal Code's unauthorized use of computer provision, depending on the circumstances. I'm not a lawyer, so check with one if you're unsure. A direct conversation tells you things about your relationship that a search can't, including whether your partner is lying or struggling with something else. If you've already looked, that doesn't make you a bad person, and it's worth telling a counsellor what you found and how it felt.

What to Do If You Suspect Your Partner

• Get specific about what you've noticed. Write down the changes you've seen, with rough dates. Specific observations are easier to talk about than a general feeling, and they help you see whether you're dealing with a pattern.
  
  
• Choose a calm moment and start with your own experience. If you accuse your partner of cheating, the conversation usually turns into defending or denying, and your spouse may shut down. You could try something like: "I've felt distance between us lately, and I miss you. Can we talk about what's been going on for each of us?"
  
  
• Notice how they respond without reading too much into it. How your partner responds, whether open, defensive or dismissive, says something about how the two of you handle hard conversations. If your partner doesn't want to talk right away, that isn't proof of anything, and your partner isn't necessarily hiding something if they need time. None of this means they're cheating, and none of it rules it out.
  
  
• Get support for yourself. Suspicion is exhausting. A counsellor can help you work out what you're seeing and what you want, whether your partner comes with you or not. Individual counselling is common at this stage, and your partner can join later if you both want that. If conversations keep stalling or trust issues keep building, it may be time to consider couples counselling.
  
  

A separate point matters here. If your partner monitors your phone, accuses you constantly, controls where you go, or you feel afraid of them, that is a different concern from infidelity. In Ontario, the Assaulted Women's Helpline, which supports women who have experienced abuse, is open 24 hours a day at 1-866-863-0511, and you can text #SAFE (#7233) from a Bell, Rogers, Fido or Telus phone. If you're in danger, call 911.

If Your Partner Has Cheated: What Comes Next

Whether your partner is being unfaithful or already has been, the first days after a confirmed affair are some of the hardest a couple will face. Shock, anger and sleeplessness are common. Many people find that what hurts most is that trust broke at a moment they needed their partner. If you are the unfaithful partner and you're reading this, you're welcome to reach out as well, because many people in that position want to understand what happened and how to repair it.

In Emotionally Focused Therapy this is called an attachment injury, a term from research by Susan Johnson and colleagues, published in 2001. It describes a moment when a partner fails to offer comfort or breaks trust when it matters most, and it can leave the relationship feeling unsafe long after the event. The Attachment Injury Resolution Model is a structured approach within EFT for working with that injury, and it's part of how I work with couples and individuals after an affair. No outcome is guaranteed. Some couples decide to stay and rebuild, and what each person needs afterward is different.

If you're there now, you can read more about infidelity counselling in Mississauga, or my posts on rebuilding trust after cheating and how one couple moved through infidelity recovery.

Frequently Asked Questions

What are the most frequent warning signs of an affair?

The signs people report most often are new secrecy around phones and accounts, schedule changes that don't add up, pulling away emotionally, shifts in physical intimacy, and money that doesn't add up. None of them is conclusive alone, and the pattern matters more than any single behaviour.

Can you tell someone is cheating just from their behaviour?

No. Behaviour can raise a question, and it can't answer it. The only way to learn what's happening is a conversation with your partner, ideally one that starts with your own experience instead of a conclusion.

What if I'm wrong about my suspicion?

Raising a concern kindly doesn't harm a relationship, even if nothing is going on. It often opens a conversation about distance that was there anyway, and that is useful on its own.

Does an emotional affair count as cheating?

That depends on what the two of you have agreed to, and the hurt is real either way. Many people describe an emotional affair as painful as a physical one, because the closeness they thought was theirs was shared with someone else.

Can therapy help if I only suspect something?

Yes. You don't need proof to book a session. You can come on your own to sort out what you're seeing, or with your partner to talk about the distance between you. I offer a free 15-minute consultation, and you don't need a referral.

Where to Go From Here

If this guide sounds like your situation, you don't have to decide anything yet. If you want to seek support, I offer sessions in person at my office in Port Credit and online across Ontario, for individuals and for couples. It's reasonable to seek professional help when something feels wrong, and it doesn't commit you to any outcome. A counsellor can help you sort through what you're noticing and what you want.

You may also find these pages helpful: infidelity counselling, couples counselling, Emotionally Focused Therapy for couples and more about me.

Book your free 15-minute consultation

This article is general information and isn't legal or medical advice. If you're in crisis, call or text 9-8-8, or call 911.

Sources

• Johnson, Makinen and Millikin, Attachment injuries in couple relationships: a new perspective on impasses in couples therapy, Journal of Marital and Family Therapy 2001;27(2):145-155
  
  
• Criminal Code of Canada, section 342.1, Unauthorized use of computer
  
  
• Assaulted Women's Helpline
  
  
• 9-8-8: Suicide Crisis Helplin