brining up the "ex"

Does it bother anyone else if your boyfriends ex girlfriend somehow gets brought up? Like do you feel like he is comparing you to her at all? Somehow she gets brought up sometimes and it makes my stomach hurt and I can't ever get her out of my head, just thinking about them two together. He said he never even thought of comparing us and that she is a POS ( which she is) but still. 😥