Boyfriend troubles

Bella

So me and my man have been together for almost 3 years and we live together and that part is irrelevant but in the beginning of our relationship he told me that when he bites his lip it means he’s turned on and all and we were out yesterday and I was talking to him and he wasn’t really paying attention, and I looked at what caught his eye and and it was some girl with a big butt walking down road, like okay I get it we all look blah blah blah but I personally hate it and I think it’s highly disrespectful and he lied when I called him out on it and I can’t stop thinking about the way he looked at her.. like he’s fucked me over in past I’ve learned to move past it and he’s like alllll about me but like the way he looked at her.. ugh.. tips ? Pls? Anybody ?