"What happened then?"

To cut a long story short:

I laid into him in a very harsh way, told him he has too many problems for me to deal with and he needs to sort his life out. He completely agreed, apologised and promised to change. I said to him you always promise but they are empty so you better deliver otherwise you'll be spending Xmas on your own.

Things seem to be going well since. Fingers crossed that he doesn't slip up.