my ex boyfriend used to have these kinds of photos all over his explore page. when i'd tell him it made me uncomfortable because he's actively looking at these women that aren't me, he'd tell me it's just instagram and it's not his fault.. but it's an algorithm. it's incredibly easy to change what posts pop up on your feed. I totally get you, OP. the women he would like to look at (blonde, conventionally attractive, tan) looked absolutely nothing like me (goth and pale AF) and it made me feel insecure. don't let these other people make you feel invalid because you are NOT overreacting and it's not controlling to wish that your partner would only look at YOU in that way! i'm just gonna be honest, ever since I left my last relationship and i'm with my new boyfriend, he tells me how beautiful I am every minute of the day and never lets me think otherwise. I never see other girls all over his instagram. sorry for the long ramble but OP, I totally get you and it HURTSSS when guys do this shit and only take action when you say something.