TG,
Good for you.
I think you're right to say a prayer for him. One of the many nuggets I have learned in sobriety is this: every person acts in a way consistent to how the world occurs to them. As crazy as your ex's (legalities aside) actions seem to the wider world, they make perfect sense to him. It is only a guess but I'd put money on this: he acts this way out of a profound sense of powerlessness and fear. He has no power over you, lacks any sense of direction for himself, and therefore is stuck in the morass of the consequnces of his actions, unable or unwilling to move forward. This is his cesspool of unhappiness, decline the invitation to join him in it by responding any more than you have.
Say the prayer, and count your blessings.
Eddie