What do i do

So when me and my boyfriend were On a break, he liked a few pictures of girls naked bodies and they were reaaallly hot. This was a while ago, but I cant get it out of my head. What makes it worse is that they knew each other so it wasn't a celebrity thing. They were acquaintances, not very close. Their bodies were so nice and I keep comparing myself and making myself feel inferior and insecure. What do I do to stop because it's eating me alive. He always tells me I'm the most beautiful girl he's seen but I know that isn't true, and I just want to stop thinking this way!!