They say it's better to have loved and lost, than never to have loved at all and I disagree, completely. To love and lose, means you end up exactly were the person who has never loved is, but with added heart break and pain. He's not been there, so he doesn't know what he's missing, unlike you, the person who has loved and lost.
Anyway, I wish you all the best, and I hope she realises what she is missing.
Benni.