It sounds like you know he's not a good guy to date, yet you still want to make things work with him. You need to ask yourself why you want to invest your time and energy trying to date a guy who has told you he's not interested in anything serious with you. Have you ever worked with a therapist about codependency and low self esteem issues? That may be something you want to do.

The pattern you are stuck in with this guy, is one of emotional abuse. Where he neglects you and puts you down to make you feel bad about yourself, but then does or says something nice, to confuse you about his true intentions with you because his goal is to manipulate you.

He won't change. But you can change yourself. You can work with a therapist to learn how to recognize the pattern of abuse and try to avoid it. Because you have tied your self-esteem to this guy (which is why you don't want to stop trying to make things work with him even though you recognize he's abusing you), you will continue to put up with his abuse tactics.