I think I would make some boundaries around the phone calls. There is no POINT to them except for him to play on your sympathy.
You are allowed to tell him you don't want any more phone calls, and that if he persists, you will be forced to file for a restraining order. It is called harassment when someone persists in calling when you have said that the calls are unwelcome.
Give it some thought. Many people here can attest that ending all contact made their lives more peaceful. If you feel you cannot end all contact, then give him a scheduled time once a week or something. It's ridiculous that you have to listen to him whine every day.