Do you ladies get mad if your boyfriend look at other girls ass in front of you 🤔

My boyfriend does this a lot. When we first started dating we would look at girls butts together (I find girls attractive specially they butts🤷🏿‍♀️) but for the last couple of months he’s been looking at them and trying to act like he isn’t but I know he is. I know he likes butts so I know wen he look at them because I’m looking at them too. I talked to him about but he just brushes it off like I don’t do that blah blah. I be wanting to slap the shit out of him.