My advice is to forget him. He might have been your first, so to speak, but he obviously has some serious problems and you did well to move on. I honestly don't think you should worry about what he wants and thinks at this point. Please don't accept his calls, call him, etc.--or else you'll be back into the same sick relationship. You deserve better. (I am being brutally honest here, but I don't think I should be mealy mouthed about it.)

If this decision is hard for you, then I strongly suggest you talk to a counselor about it. Okay?