bf troubles.. help pls??

Recently my boyfriend has been liking a bunch of pics of sexy girls on instagram and everytime I see it, it makes me feel like shit. I feel like I'm not what he wants and that he would rather have those girls. We've talked about it but I still see it. I don't wanna be controlling him (making him unlike them and unfollow those girls) but I hate seeing it. I know that im super insecure and that's the main reason but idk how to feel and don't have someone to talk to about this. When I'm around him I don't feel special anymore.. idk what to think or feel.. help???