Gosh, do you have to ask? A man who, during the courtship, marries someone else and shows no inclination to leave her....is not likely to make you happy. Your heart wants the fantasy you created about him and what you two could be to each other. Your head is aware of the reality. Give up the fantasy and let go. Once you face the fact that he is never going to fulfill your fantasy, you will feel sad but you won't be hooked on the pain anymore.
What is it you are looking for with this man? If he is cheating on his now wife what makes you think it would be any different with you if he did decide to leave her? You'd be setting yourself up failure if you didn't just walk away. Find someone who respects the women their with and wouldn't do this to you!
Don't worry about a heart break because time will heal that. Love yourself a little and leave.
Think about the situation for a while then you should get the right answer
bad situation. geddouda there fast **** what your minds telling you..listen to your heart.