How do I (21 M) get over my girlfriend’s (20 F) sexual history?

The best action is to make quite the sexual history with her, yourself. Try to be a selfless lover, focus on her and it should all work out. You are (probably) the only one with a sexual history and future with her. Make that as good as you possibly can and soon you will never think of those things again.

Be open about what you like and inquire (and learn) what she enjoys. Don't compare yourself or her to anyone and turn your insecurities into motivation. I don't think this has anything to do with toxic masculinity or anything. Just a lover who is a bit insecure about his experiences and who cannot stand the thought of his partner being touched by others. That can be completely healthy. Just refrain from blaming/acusing her or ever put her in a position where she has to defend her past to you. Why are you still reading this? You have a girlfriend waiting on you.

/r/relationships Thread