You should leave her alone and keep your dignity and self respect. No ifs, ands, or buts!!

Let it go. You aren't going to have a very satisfying relationship with someone who uses and manipulates like this. Is there a reason you don't think you can do better than that?

You should move on love, it might be easier said then done, but it's the right thing to do - you know it already. Hold on to your dignity and self-respect. Heart ache will pass.