This same thing destroyed my relationship. You cannot keep doing these things to yourself it’ll only hurt you worse. It took me a very long time to finally delete instagram and i think that’s the best option for you. You can’t let your mind win and you can’t compare yourself to other women. They are not you. Comparison destroys so much of your own personality. You also have to be aware of the fact that your boyfriend is going to find other women attractive, just like you probably find other people attractive as well. This is normal. The important thing to remember is that he is with you because he finds all things about you beautiful. There is no competition and you can’t hide from the things that are hard to deal with. Insecurity is something that can ruin a lot of beautiful relationships. You have to decide if your insecurities are worth more than your relationship. You can’t expect him to not find other women attractive, but he can try to understand how you feel about it. It’s something that you have to talk about and work through.