I caught my boyfriend checking out another girls ass, but he refuses to acknowledge it. Should I break up with him?

We were walking in a nearby park and I noticed this girl walk past us. His eyes went to her lower body/butt and I could tell he checked her out. I mean, I don't blame him. She had a nice ass! What made me upset was the fact that he kept denying it which made me feel crazy. He said he was looking at the guy next to her's tattoos instead and that he doesn't remember looking at her butt. I tried telling him that it's ok if he did look at her butt and that I wouldn't be upset, but he kept denying it regardless. After he noticed that I was upset, he finally decided to admit that he checked out her butt JUST so that I could be happy (and not because it was true). I then noticed that he got upset and decided to tell him that I believe him even though I don't. Would this be something to break up over? Or am I making a big deal out of it?
I caught my boyfriend checking out another girls ass, but he refuses to acknowledge it. Should I break up with him?
Post Opinion