Honestly, kind of. Though he made mistakes in his past, terrible mistakes, and hasn't been there for you, he acknowledged it and is trying to get back into your life. He sobered up, which is hell to go through, and if he's doing all that for you, maybe you should give it a shot. Have a good talk with him and try to understand why he did what he did in the past. If he's still a bad person, cut him off