I am sorry for your troubles. But you can't be engaged to someone who is legally married. It doesn't matter what he says about not loving her, etc. I'm sure she is getting a totally different story. Truth be told, this is another woman's husband, and they have kids. So you are free to find your own husband. He is a serial cheater, and won't change. So save yourself a lot of heartache and find a man who treats you like a princess, not this guy. I wish you luck.