Dating

Is it a gut feeling or is it paranoia?

So. Me and my boyfriend have been through a lot the past 2 years. Trust is something we are definitely trying to work on. We were split for 2 months. When I came back, his roommate/buddy had a new girlfriend. ( only dating for 2 weeks ) she moved in. Well I decided to move in as well. They all work together. In summary I thought my boyfriend and her were flirting with each other. I ended up finding out that they have hooked up in the past. Well this made me VERY uncomfortable. Especially considering our past, I just didn’t trust him around her. 6 months later, we all still live together. He used to make me feel uncomfortable when we were all hanging out because I thought he would flirt with her but now, he doesn’t do that. However, I get super jealous or irritated when they even make conversation together. Me and the girl talk and get Along with each other but I just don’t like my boyfriend talking to her. Me and him actually get into arguments sometimes. He says that he considers her a friend and that’s his buddies girlfriend so he’s not gonna not talk to her and that we all live together so it’s kinda hard to not be friends. I mean I guess I get that. I don't know sometimes I wonder if he likes her but then I feel like it’s just my paranoia from our past. What do y’all think?
Is it a gut feeling or is it paranoia?
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