It's just jealousy. Everyone feels it. I get super jealous. You just have to decide when it is ok to just be jealous if you know nothing is going on and trust your S.O or when you should talk about it. If there is a reason for you to be suspicious... bring it up and talk about it.
You should also bring it up if it bothers you a lot. There shouldn't be big things between you because that will drive you apart. Eventually it will probably come down to either you or him if it really does bother you that much. But that's ok. I stopped talking to a guy friend of mine I slept with even though I still would want to talk to him. But my relationship is more important and so that's what I put first. I'd rather have a good honest relationship without any worries or things like that bringing us down. If I was to keep talking to that guy, and comparing him to my boyfriend now I know that would make him feel bad and cause problems. So I don't do it. But sometimes I think things like that. I definitely compare them in my head sometimes and I think about my ex too. I can't stop those things.
So take it from me, an INTP female. I think you should talk to her about it and tell her how it bothers you. She probably doesn't realize that saying those things, comparing you guys hurts you as much. I used to do that before I realized it really just hurts the guy and doesn't help anything.