Should I stay after they cheated?

You can stay after they cheated, and some couples come through it. But in your 20s it’s also fair to treat what happened as information about whether this relationship fits the life you’re building. Decide based on what they do next and what you actually want, not on your friends’ votes or how messy the group chat will get.

Why does everyone have an opinion?

Meet Ari, 23. Ari and Kai have been together since junior year, and their friend group is basically one big shared apartment of people. Then it comes out that Kai hooked up with someone at a mutual friend’s birthday. Within a day, half the group has messaged Ari (“you deserve better”), two people are quietly staying neutral, and one friend is clearly on Kai’s side. Ari hasn’t even decided how they feel yet, and there’s already a vote.

That’s not just drama. Friends’ views genuinely track with how relationships go. Sociologist Diane Felmlee studied 290 people and found that feeling your friends approve of your relationship went with it lasting longer.1 Interestingly, perceived approval predicted stability better than actual approval did.1 What you believe your friends think matters a lot.

A 2014 study by H. Colleen Sinclair and colleagues followed 396 people for three to four months.2 They found no sign that disapproval brings couples closer, the old “us against the world” idea.2 People who felt more interference or less approval from friends and family reported poorer relationship quality.2

So your friends’ reactions aren’t irrelevant. But approval and the right decision aren’t the same thing. Friends see a slice. You see the whole picture, including the parts you haven’t told them.

Is it my fault they cheated?

A lot of people quietly ask this, even when they’d never say it to a friend. “I was so busy.” “I wasn’t fun anymore.” “Maybe I pushed them away.”

Here’s why that question deserves care. Researchers Shrout and Weigel surveyed 232 college students who’d been cheated on in the past three months, almost all still in the dating relationship.3 People who blamed themselves were more likely to cope in ways that hurt their health, like eating less or drinking more, and that link ran through worse depression and anxiety.3

Relationships have two people in them, and it’s fine to look at what wasn’t working. But the choice to cheat was theirs. If you notice self-blame turning into skipped meals, heavier drinking, or not sleeping, that’s a sign to get support for yourself, separate from any decision about them.

Will they do it again?

You can’t know, and anyone who tells you for sure is guessing. Research can only describe patterns across groups.

Knopp and colleagues followed adults across relationships and found that people who reported cheating in one relationship were three times more likely to report cheating in their next one.4 That’s a real pattern worth weighing. It’s also not a prediction about your partner, and it tracked people into new relationships, not couples who stayed and worked on it.

What you can watch is what happens now. Did they tell you, or did you find out from someone at the party? Have they changed something concrete, like distance from the person involved? Can they talk about it without turning it into your reaction being the problem?

Facts, reading, fear, next step

When the group chat is loud, try writing four lines just for yourself:

• What happened: “Kai hooked up with someone at the birthday. Kai told me two days later.”
• The reading: “Kai doesn’t take us seriously.”
• The fear: “If I stay, everyone will think I’m a pushover. If I leave, I lose the whole group.”
• The next step: “Talk to Kai alone this weekend about what happened and what changes.”

Notice how much of the fear is about other people. That’s normal at this age, when your friends and your relationship are often tangled together. It’s also the part least likely to still matter in five years.

What to do this week

1. Get tested. The CDC says nearly half of new STIs each year are among people aged 15 to 24, and many cause no symptoms, so testing is the only way to know.5 It’s routine, it’s not an accusation, and most STIs are curable.5
2. Pick one confidant. Not the group chat. One person who will ask what you want instead of telling you.
3. Ask the group for privacy. “I love you all, I’m not taking votes right now” is a full sentence.
4. Have one honest conversation with them, alone, about what happened and what would be different. Watch whether they own it.
5. Pick a date to revisit it, say after the semester or the next big trip, instead of forcing a verdict now. You don’t have to decide while everyone’s watching.
6. Get help if it’s heavy. If you can’t sleep, can’t focus on classes or work, or you’re coping in ways that worry you, a licensed mental-health professional is the right help. Campus health centers are a good place to start.6

What doesn’t the research show?

• The friend-approval studies looked at relationships in general, not ones recovering from cheating.1
• The self-blame study was a survey at one point in time, so it shows links, not cause and effect.3
• The repeat-cheating finding is about groups and about new relationships. It can’t say what your partner will do.4
• There’s no research-backed right answer here. Staying can be a good decision, and so can leaving. What matters is that the decision is yours.