Is there a counselor, in your area, that you could see? Your post sounds like a very deep depression, I'm not an expert, other than having depression myself, hence, the recommend.

How long, ago, was the break up? How long, were you, together for? I don't think, it's a good thing, for him, to try to be your friend, after leaving you, for another. Blocking fb, after a break up, is a sound decision.

Sorry, you are struggling so much.