There is a big difference between giving up and having had enough. When we give them chance after chance and nothing changes, then we know it is what it is. Doesn't mean we don't still care about them, it just means we have had enough.
Good on you for blocking his number on your phone and on facebook. At some point, he will fall through that thin ice. Chances are he'll eventually get kicked out of Oxford House and then he'll be on your doorstep begging for a place to stay. He'll promise anything to try to break you. I hope you don't even give him the chance.
Use this time to make yourself stronger. Have absolutely no contact with him. Don't allow friends/family to talk to you about him. You need space, and a lot of it. You need time away from anything to do with him. It will allow you to become stronger. You can do this and we're here to support you. (((HUGS)))