You need to contact an attorney immediately. Today. Go through Legal Aid if you must, but find out your legal rights.
In the mean time, assuming you can't kick him out today, I think you should change his circumstances there in your home right away. Raise his rent. Put his belongings in the basement or garage. Make him sleep on the couch or floor in the laundry room. Do you get what I'm saying? He doesn't get to live in comfort in your home anymore. He no longer has access to the kitchen. Lock everything down with padlocks if you have to. Make his life a living hell. Considering that he was going to dump you, I should think you'd find a great sense of healing in doing this. I would go so far as to turn the water off to the showers/tubs so that he has to go to the gym or YMCA to get clean.
Put a deadbolt on your bedroom and put everything you value in there. Move your furniture in there. Put the TV, computer & phones in there. Shut him out of every possible modern convenience.