I love my ex and she is haunting me?

Sounds to me like she is keeping you on the back burner just incase things dont work out with this new guy. I'm sure that hurts your feelings to hear that, but I'm sorry.. If she loved you as much as she said that she did she wouldn't have cheated on you. You can go with the whole "people make mistakes" thing, but if you excuse her actions once, she might think that she will always get the privilege and she could continue to hurt you. You said that moving on is out of the question... Then I guess all I have to say to you is sit there and put your life on hold and wait for someone that may or may not come back to you.. Personally I think that you should walk away.. you seem like a very nice guy that deserves way better than that.