Boyfriend disrespecting me?

Hey guys so i wanted to ask you guys for some advice.

I’ve been in a relationship for 4 months now, not that long still pretty fresh! But i love him a lot. Now theres this thing i am really struggeling with.

My boyfriend keeps telling me to have plastic surgery to get my ass and boobs bigger, and not to mention he said he wants to pay for it. It’s not the first time we had struggles about this. He used to follow a lot of instagram accounts of naked girls too. And i dont know but that really makes me all feel really insecure about myself. As if the relationship is all about my body. Now im not the type that wants to break up quickly but i kind of don’t know how to talk to him about this since i already talked with him a lot of times about it but he doesn’t seem to listen?

What advice can you guys give me?