Strong urges to call my ex for ?

After nearly 4 years and having the greatest of my life, our relationship ended. We don't talk anymore, but in time will start again. I flat out told him that I would try to have with him if we hung out- I still love him very much. Im fending out for ! How can I control myself from wanting to reach out to him? I know it would be a disaster- we don't want to date anymore and we would hurt each other. Yet again I miss the !