How to deal with it

So i used to get super mad/upset and feel disrespected when my boyfriend would like pictures of other girls on instagram. It bothered me so much because most of them were models and were always half naked. I expressed my concerns to him and it stopped a lil but he still follows girls that are always showing too much. This is why i dislike instagram, i feel it has so many attention seeking woman. Who would do anything just for likes. I guess it bothers me so much because I'm not with my boyfriend so much....so his eyes wander. I get jealous and i get a little insecure, I'd never call myself ugly but i feel inadequate.

Also I'm trying to talk with him about it now cause he knows somethings wrong but idk what to say i hate expressing my feelings. Help me