What should I do about the girl I like?

Theirs this girl that I REALLY like, and she’s my best friend. We literally text everyday and I know she trusts me because she tells me all of secrets and things she doesnt tell anyone else. Theirs a BIG problem though and I dont know what to do anymore. She isn’t a slut or anything.. but she’s definitely had her fair share of “experiences”. And since we started hanging out she kinda slowed down and didnt do anything with anyone for a while and she was good until like last weekend. And she told me the truth about what happened, and im happy she did and she didnt lie about it, but it literally just rips me apart when I hear that she gets with other guys.. I know she has to like me at least a little bit because I asked her to prom and she said yes, but im not sure if its because she actually wants to go with me or because no one else asked her…So now im not sure what I should do, should I just try and move on and get over it, or tell her how I feel and see how that goes?