Stop talking to her because this is adding to the torture your already doing to yourself.
Move on and let her go. You owe her nothing and neither does you. She have her own life to live and so do you. If she wants to run around with a married man than let her because she is going reap what she sow. Karma will catch up to her.
You still have life in you and I know break-ups aren't easy but believe me you will survive and behind every dark cloud is a rainbow waiting to appear. You can do it but you have to want to.