Become the best version of yourself you've ever been. Stop lamenting. Don't ever be clingy, wishy washy, sad, crying, etc. around her. Stop being so available for her.
Do stuff with your life. Get in shape, update your wardrobe, go back to school, go out and do really fun things, get new hobbies, get new friends, have lunch/coffee with females, etc.
Trust me my friend, she'll notice. The people here that do those things usually end up with a WAS or WS that want them back. Then the power dynamic switches to your side of the court. The kicker is at that point you may not want them back. You've now become very attractive and have this awesome life going. They, on the other hand, are just a cheater. Nothing attractive about a cheater.
