Basically, my boyfriend and I have been dating for a year and a half. About 6 or so months into our relationship, he told me that he used to have an Inflation Fetish (where women's breasts and butts inflate with air and grow larger). He told me that he'd kicked the habit before we got together, and it was nothing to worry about ... this turned out to not be true. Multiple times within the past year or so we've been together I've caught him lying about searching up and jacking off to real women with big breasts, not just inflation videos. We actually broke up around our anniversary because he saw me watching a clothing haul and went back onto Youtube to find the girl and jack off to her later ( in addition to host of other problems).
The problem is is that I'm considered a skinny woman. I have a nice hour glass shaped body, but small boobs. As of late, I feel like I have to beg my boyfriend if I want to have sex with him. In addition, I caught him today lying about jacking off to girls again. I feel like he's constantly lusting after women with big breasts, and I feel like I can't trust him because all of his female friends conveniently have super big boobs and are always flirtatious with him. I go out of my way to please him (super successfully), and he struggles to make me orgasm. After a curious look at his history, I saw that during times when I'm texting him he's either speaking to his female friends or searching up girls with big breasts.
I feel like he's just not that interested in me anymore. He was a virgin before we met. I am a living breathing woman that wants to have sex with him, and it's just like hello pay attention

He's a really good boyfriend and claims that he's attracted to me, but the big boobs are just "the fantasy". However, this doesn't make me feel any better. It's making me feel super insecure because while all of my ex-boyfriends have been super attracted to me, they all seem to prefer the whole big boob thing.
I think of him when I wake up and before I go to bed. He ignores me and thinks of other women.
I'm super frustrated. At this point, I feel like I might just have to call it quits so that he can find a girl with big boobs and be done with it. I want to feel desired!! I want to feel like I'm a priority. What do I do? Please help.