How can I get over my girlfriend having sex with a pro athlete before she met me?

He just used her a couple times and she never got a date or even a drink out of it but she was so enamored of him that when I met her she played me a clip of him and made it clear that that he is the pinnicle for her and he is amazing but she felt out of his league and didn't think she could have him. She now claims to think I'm amazing but she can't take it back and I'm still angry
How can I get over my girlfriend having sex with a pro athlete before she met me?
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