button you don't need to move away that would not solve anything, you would just be running and it NEVER solves anything. If my ex cheated on me and her new GF had the nerve to say hi to me, I believe i'd give her a verbal lashing, it wouldn't solve anything but she would know how I felt about her and I promise she would never say HI again.
You did nothing wrong here, your x did and unfortunately we cant make people say, do or feel anything...we all have free will. Stop concentrating on her and what happened and start concentrating on you and where you are going. There is someone else out there for you and I would hate for you to miss out on that. I know it hurts, believe me I know. But in the end the only person we have control over is ourselves, so all you can do is accept this and take solace in the fact that she missed out on a great thing, which is YOU! Give some other lucky person a chance and learn from this relationship what you DONT want.