You can start by blocking him on any other communication devices. You don't need to listen to him degrading you. He is miserable and just wants to drag you down into the same hole he has managed to dig for himself. The longer you go without having to deal with him, the stronger you will become.
Welcome to SR! You will find a lot of support here. Many of us have been in the same or very similar situations, so we understand what you are going through. Please read around the forum and post often. It will help.
