You should be ashamed of yourself. Is it all about you? If he were to leave his wife, you can bet you will soon be in her shoes. "You reap what you sow."
I know from experience that if a girl would sleep with me and know i'm with another female, she is a Ho and can be replaced by another Ho. Men will keep it going as long as the can, because you have allowed it.
A man can and will never respect a woman who behaves like you have. You have disrespected yourself and will have nothing but trouble to show from it. As God is my witness, a man may ask for sex, but he will think you're a HO, if you give it. If you give it up, to a man who is already taken, then you maybe you should stop and think if he is a real man.
Stop being selfish, ditch the married boy and work on your self esteem. There are plenty of men looking for a real Woman...
God Bless you and good luck...