Ok, I could tell you what I think you should do but your question was what would I do and feel about it. I would feel that it was a bum deal. He was getting a wife and a girlfriend and I was getting half of a guy. I won't even get into the sharing/sex aspect. I would also be mad that he is just now bringing this up AFTER I moved cross country to be with him after we had discussed marriage before.

What would I do? I would say "best of luck to you but our values are too different for any kind of relationship." Then I would begin my life without him and after some time figuring out how I came to be with someone who did not respect me or the relationship, move on in the dating world.

Best of luck