Boyfriend masturbates to Instagram friends?

Hey, so I basically found out my boyfriend masturbates to my friends instagram profiles. About 4 or 5 of them, and 2 of them happen to be his exes which understandably frustrates me. 😐 The worst part is that all of the ones he chooses to masterbate to are curvy and booby and I'm thin with a flat chest. And he says he "LOVES" my small boobs but hey I seriously doubt that now considering the juxtaposing evidence...... Ive never felt womanly because of this and NOW I feel entirely inadequate, I hated myself already well now I completely despise my appearance. What the fuck do I even think about this? I'm not even angry I just feel hollow and fucking hurt. I dont even particularly want to talk to him about it because it's such a vulnerability on my behalf and maybe I don't want to see the truth in his eyes when I ask him what he sees in them that he can't see in me because I already know. We've been together for 2 years so this hurts alot. I would have thought he wouldn't think of those exes anymore much less like that 😨 how am I supposed to just be okay with him doing this? In reality I assume it won't stop. I guess this post is for any woman who feels less woman than she has to right now because a man made her feel that way :( we all deserve to feel beautiful.