Is he just being nice, or interested, I've been out of the dating game, embarring?

It sounds like he is busy and it might be difficult to hang out. I was going through something similar-- only I was literally going out of my way to make it happen and it never did. I think you are doing nothing wrong. The only thing that I can see that is wrong is him blaming the hang over for getting mad at you. That is a excuse which is always wrong.