Quote: He lied, told her we're not seeing each other anymore, and she believes it. Why?
She believes him because he's her husband and she loves him. You should not be so quick to judge. What you really should be asking yourself is why, when you know he lies to her, do you still believe anything he tells you?
Mrshurting is right. Why do you feel a need to hurt other people? Why do you want a man who thinks it's OK to cheat on his wife or would needlessly hurt the one he loves?
I'm sorry to be harsh, but you are in need of a serious reality check. He is lying to both of you. There is a very good chance that before long he will begin to miss his W and go home.