Boyfriend

So Tonight my boyfriend brought up a little disagreement we had at the pub the other day, basically we were talking about a festival with mates when he says that there were a lot of titties so I get all offended, and he re brings it up tonight when we're with friends again and makes everyone team up against me saying that it's alright for him to say that, and now I feel like I'm really stupid for getting annoyed that he was checking out other girls tits at festivals, is this bad of me ?