Ok first up we are non-monogamous, so shagging other people is legit and above board.

My (M37) boyfriend (M36) has a new relationship with this guy who lives 4 hours away. I don't like the new guy tbh, he gives me the creeps, and I think he takes advantage of my bf. But anyway my bf likes him so I guess I just have to deal with it. I don't like it but I wouldn't ask him to stop seeing him (they're in love and in that new relationship stage).

So while he was away visiting the new guy and I was feeling lonely and sad I thought I'd try to take my mind off the situation by having a hook up with a guy I've seen once before. I know my bf isn't a massive fan of him, but I figured I'm a big boy and can take care of myself and I'd quite like a no strings hook up with a hot guy so I went for it. It was nice and we talked about hey maybe we should make this a regular thing. Told my boyfriend afterwards that we hooked up and he got really upset and it turns out apparently he really HATES this guy.

So now I feel bad about upsetting him. Tbh I could try to find someone else to hook up with in future that doesn't piss him off. But yknow his other partner pisses me off, and I don't wanna be sat at home like feeling lonely while he carries on dating a guy that I don't approve of. What I do not want is for resentment to start to build up. So I kinda want to keep seeing my new fwb because otherwise I'm just gonna become resentful of my partner's other relationship and that would not be healthy.

(Just to clarify this is not a pure jealousy thing, we each have other partners who the other is perfectly happy with. It's about having a specific problem with somebody based on 'red flags' or whatever.)

AITA for wanting to keep hooking up with this guy even though my partner hates him??