Break off all ties from this *****. Even after a breakup he will try to drag you back into his universe. Don't let him. Just walk away. Just say I'm not talking anymore. Don't answer his calls. Don't give him ANY reason to think that there is still hope. EVER. If you can get a few months under your belt, with zero contact, then you can go into phase II, which is being flabbergasted if he ever tries to call you or see you.

I hop you aren't dependent on him for food and shelter. If so, you gotta fix that obstacle. Quick.