>>126195It's possible to be in love with one person and also have some sexual attraction to someone else, especially in the early stages of a relationship when you're just starting out. One of my friends felt this way about a guy she met even though she was already dating someone else, but she decided to let go of those feelings because she loves her boyfriend and wouldn't want to hurt him like that. It was a fleeting sort of attraction and she never intended to do anything with it. Some people never feel this way about others while in a relationship, but if someone does, it doesn't mean they'll just cheat on their partner. It'd be a cruel and frankly stupid thing to do. Even if things are not going well in a relationship, normal people will break up (if they can/aren't in an abusive relationship) instead of cheating. For one, because most people wouldn't want to hurt their partner and also because being a known cheater has the potential to endanger future relationships.
>screwed with one of his closest friendsSounds like he'd wanted to have sex with her for a while and wanted to do it before he couldn't anymore, presumably because he doesn't want to cheat. You can have sex with someone without it being that romantic, although a friendship can feel similar I suppose. I'd imagine that this step messed with their friendship anyway though. Probably also made it easy to cut ties with her.
>I resent him SO much for it>I haven't told him anythingHe did apologise and cut ties with that girl, but imagine if you confronted him now. Is there anything he could say to ease your worries? Anything he could do? Or just listen and be empathetic?
>I've become the most insecureCan that one instance really do that? Did he ever flirt with anyone else in front of you or said things about being able to get with other women easily? Bragging about anything even close to that he could be a player if he wanted to? If yes, that's a definite red flag, but if not, he's probably fine, right? Maybe you should tell him about your insecurities regardless. In fact, why haven't you talked to him about it? Do you think he'll blame you for feeling that way, for not being able to let go, are you worried about him being angry about it? If you convey that you do think that he did his best there and that it's really about you and your insecurities and wanting him to support you to ease your anxiety you can't seem to let go of, he should have nothing to be upset about. It's not something he can just "fix" but for me, I'd want my boyfriend to know, I wouldn't feel good about something that worries me so much to just be invisible to someone so close to my heart…