Sometimes it makes me feel guilty, I feel bad for her husband, and she says that too but still with me. I am single and planning to get marry in 2008. Do not know what should I do for sure I don't want to marry her, because I don't want to brake her family as she have two kids. I just can't stop callling her and she can't stay away from me either... help me out!

Well you can stay away from her you just don't want to.

Tell her its over and to go home and work on her marriage. Block her phone number, email address, etc. Do not contact her. Muster up some will power here. Decide that you are done with this and stick with that decision.

I would also call off your wedding because it appears that you are nowhere near ready for marriage. If you can't be faithful to your fiancé now what is going to stop you once you are married?

I don't consider an engaged man to be "single." You're about to be married... how would you feel if that was YOUR wife cheating on YOU?