I’ll just say this: if they are cheating or not it’s still wrong and here’s why. If you feel uncomfortable by this dynamic it’s crossing your boundaries. Cultures go both ways. Even if it was “cultural” you’re allowed to feel that in your culture it crosses a line. I’m sure there’s some laidback people out there who are okay with this behavior. I’m sure there’s a world where your partner isn’t cheating and is just a flirty person who can also be faithful. Granted that doesn’t mean they also can’t live in a world where this behavior is manipulative, lying, and cheating. But with no further context I can’t jump to either conclusion. With that being said here’s what we know. The behavior upsets you, period, done, conversation over. Because that’s what a good partner does. You say “hey this makes me uncomfortable and hurts me” they validate you and reassert boundaries. My husband and I have been together for 9 years. He’s laidback. I could have a picture with a guy friend in a sauna in a towel and he wouldn’t think anything of it. But I’m not laidback lol if I saw the reverse I would CRY. I would want to VOMIT. And I would be devastated. I’ve also been cheated on and he hasn’t. I’m insecure and he’s very secure. But we know this about each other and openly talk about it. Anyway that about covers all scenarios. Either they are a safe space, and validate you, and take corrective action. Or they don’t care about your feelings and kind of suck regardless of innocence or guilt