jealous of selfies??

Hey girls! So i just need a little advice or maybe some insight on how any of you have dealt with this situation or just let it be (cause it is in fact a very minuscule problem). 
I used to look at my boyfriends instagram a lot "just browsing" to actually see who he follows (girls) and such, but that was like 2 years ago. Recently though, with the instagram updates, i can see that he like many girls photos and I wouldn't mind it but he also likes bikini photos from them and selfies. I know its not something major but i think it bothers me most cause i voluntarily deleted guys i followed unless i associate with them daily (class, work, volunteering etc.) but i stay away from liking selfies or anything showing their body cause i just find that to be a respect thing towards my boyfriend and i would feel awkward if i did.
I've brought it up before and he said that they are friends from high school, & i told him i deleted old guy friend & he didnt believe me lol but i know for a fact he doesnt talk to any of those girls anymore, it just weirds me out. Any advice?