Most Helpful Guy
If you really really want to change his mind try not pay attention to him, and let him send message to you, eventually he will come back to you, or maybe not. The reason is because if he still likes you he will come back to you.
However in normal prospective if he had cheated and dumped you maybe he's not the kinda guy for you and he's sorta using you as a backup plan, or other kinda stuff.
Most Helpful Girl
You may not want your ex to disappear completely from your life. But you may NEED your ex to disappear completely from your life so that you can move forward and recover without being distracted by the hopeful fantasies and dreams he made you believe in about the two of you.
Why do you let him walk all over you? Why do you even give him the option to remain invited and included into your life after he betrayed you then disposed of you? That shouldn't even be an option for him. It's like this guy shitted all over you and screwed you over yet you willingly accept it. That's not healthy, girl and it's going to kill your self-esteem.