If he were your husband my answer would be different, but you are not obligated to this man. Don't do this to yourself. Sticking around and working through mental illness is a WIFE's job, not a girlfriend. You could stick around and do all of that for him and still not even end up together. You don't owe him anything. You need to get out of this while you still can. Encourage him to get help, pray for him, and leave him ALONE!