He needs to earn your trust. Maybe he will get OK, and maybe he won't. Time will tell. You will know. Clinicians recognize that antisocial personality disorder is very difficult to treat.
Angry individuals vary in their degree of sociopathy.
In general, the more sociopathic the individual, the worse the prognosis. The angry people I work with are clearly selfish. They are also ordinarily compassionate and well-meaning. I have yet to meet one who was not. All reason, all empathy goes out the window.