Boyrfriend checking girls out. HELP PLEASE!

so about 2 years ago (yeah, i know. im “crazy” cause i still think about it, right?) i was out to dinner with my boyfriend and my family. we had been dating for about 8 months at the time. while we were waiting to be seated, he was on his instagram scrolling through his newfeed and i was sitting beside him and he randomly yelled out “HOLY CATS!!!!” i looked on his instagram and it was a naked instagram model who had a big ass. i was so hurt. i still am so hurt. i have been so insecure about myself ever sense then and it’s affecting our relationship so bad. i went on his instagram and saw he was following TONS of instagram models. i MADE him unfollow all of them. i got to the point where i would watch him in school check out all the girls with bigger asses and i would make myself upset on a DAILY basis and we would fight every. single. day. finally, i just stopped looking at him so i wouldn’t put myself in a bad mood. i still think about when he did that to this day and it still makes me so furious and upset! we’ve almost broken up over him staring at girls out in public places multiple times, i’ve told him how i feel and he either shrugs it off, calls me crazy and says all men do it, or tells me he didn’t even do it and i’m mad for no reason. then, he openly admitted that he watches porn! great!!! now i’m even more insecure about myself because he’s getting himself off to all these women with big asses. i confronted him about that and told him to stop because he literally has taken videos of us having sex so many times there’s no reason for it. it is completely eating me alive and please don’t tell me i’m overreacting. i don’t care if you think i am, this is a really big deal to me and i need advice. i’m tired of being called “crazy” or “not fun to be around” or him telling me to “just go home” cause “all i do is bitch” at him. this is an issue and i’m tired of feeling like complete shit about myself. i’ve posted pictures of my body on my instagram where i felt beautiful and confident and he has never ONCE said anything about the pictures i posted. i’m tired of this. i love him but i want to love myself too:( sorry for the long post i just don’t know what to do anymore..