Re: Had to turn down girl I liked
I think it all depends on the type of person you'd want to be and eminate that. Everyone has enemies and as well as pasts. I agree with grey2fox as to how to reframe yourself if you want to give her the chance. This isnt a scenario where you can or should be qualifying her because this is mostly based on your inner game.
Something to think about is what if you were in her shoes? You slept with her enemy, how would you expect to be treated and how do you think you would want to be treated. I wouldnt suggest talking about all this unless you need to say something so she can help you get past the problem you are having.
Best of luck.
Every moment counts, get out of your head and enjoy it.