I agree with Hawkeye about the storage unit. But I'd also see if there was a way to take my name off of it (if it's on there) first. Read up on their policy and talk to the manager. If their policy is to send non-paying accounts to collections, if your name is on it, even with your stuff out, if/when he doesn't pay, collections'd go after you, too. If you need to keep storing items, you could also see about moving your stuff to a smaller (cheaper) unit and returning the key for the formerly joint-use space to him. That way you're one more step away from having to deal with him on any level.
I completely understand about the strengthened resolve to stay off his FB page. I did the same thing a few weeks ago. All it did was tick me off (with him and myself) and didn't resolve a single thing. Vent away if you need to and then get up, brush yourself off and keep on moving forward.