Hey, a sexual past is nothing to be ashamed of. She should not feel less of a woman or loyal to you for having had partners before. I hope she is able to understand that eventually.

That said, by insisting your partner doesn't have contacts of their previous partners/crushes, one implies a belief that they will be unable to control themselves if an opportunity to cheat arises. Trusting one's partner extends to believing they will make the right choice if someone offers them the opportunity to cheat. If your girlfriend has trouble doing that, talk with her about what could be causing these trust issues.