If at all possible, I'd say going no contact sounds like the best option. Block his number, e-mail or any other way of communicating. It's easier said than done, I know, but it will help you get past this. My ex and I kept in touch for a while after we broke up, before I finally cut off the contact. It was tough at first, but I realized it was only dragging things out and causing me more pain in the end. Good luck!