Time and patience are the only "remedy" here. What you might do is set a time limit for yourself, what YOU can realistically deal with. How much time are you willing to give this relationship before you feel you have been as patient as is reasonable? After that you just have to tell him how you are feeling, see how he responds and make your decisions from there.

He may really just need more time, 3 months isn't much time at all. He may need some professional help to get him going on a path that leads to a healthy relationship. He may be hopeless. Only time will tell. Only you can decide how much time and PATIENCE you are willing to invest in this relationship.