I think you would be throwing good money after bad by hiring an attorney about the house. You have not been paying the mortgage, you did not put money into it either, so why even bother? I could see if you put money up for the down payment etc. but you didn't, so IMHO, just walk away.

Actually, what you need to find out is if your name is on the loan where you are held responsible if he fails to pay. Make sure you did not cosign anything, that can end up being a mess, as Eskie has explained.