Should I leave this Attached Man with a Child Alone?...(More to it than the headline)?

[Vicky Lovers]

I dated this guy for about 4 or 5 months before I found out that he was living with his long term girlfriend and she was about to give birth to their child. I quickly ended things. And things like this are no never easy. Needless to say we went back and forth quite a bit since he was controlling and strict. I didn't feel like he had the right to have any control over me considering his situation. But while we were together we really got to know each other. And while we were both wrong I actually like him as a person minus his lies and deceit. I would never date him again! For many reasons! But he is very smart, he's a good listener, he's objective. All the qualities you'd want in a friend. Toward the end I felt like his friend instead of his "girlfriend on the side" I guess maybe I was trying to delude myself. But ever since I ended it for good he seems to be really hurt. Saying things like How could I do this to him and I betrayed him. I feel bad about that even though I know it isn't true. I told him that I really do care for him but we can never be together, even if he worked his situation out. Our romantic relationship started on false ground so we would be doomed. I know this. But he doesn't. Now he's decided to just ignore me altogether. If I don't want him romantically I can't have him at all.

Is that fair? Should I still try to befriend him since that is what I miss the most? Or should I just get on with my life and come to terms with the fact that he is an all around selfish person and we can't even be friends. I'm just really confused. I know some people will be mean and that's cool. Nothing I haven't heard before. And it will slide right off my back because I know I was wrong which is why we are no longer romantically linked.
Oh and the back and forth lasted 2 years. Took me a long while to learn.