You are in a point where you have to push yourself to detachment. I believe it is possible to get over while still seeing the person, its just the matter of self discipline. People can do it, buddists do it, vegans do it... While you accept the fact that she is indeed a very good and kind person, you have to realize that she doesn't need to be with you, and therefore, you don't need to be with her. Drop egoism. Don't try to think what she thinks, don't try to play games with her etc. Aknowledge that she is happier without you and you want her to be happy, right? If you can't do that, then she was never a right person for you, you are not in love, its only a bit of crush, its all in your head which can be swept away.
Right now you seem to be stuck in the situation where you don't look another girls. Just, why??? How many opportunities have you lost with that? How many good people have gone by? Don't waste time and don't let anyone else (she) waste your time also.

Come down to earth and face it, she is just another person, just like you are.

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Think again!