Changing who you are on the outside is a whole lot easier than changing the inside. Since you’ve known him for a lot longer you know what he’s trying to cover up. You might also have to confront him about your emotions otherwise this hatred you have for him will never subside. He might also need to talk about it too, cause if he really wants to change he’ll have to confront all his wrongdoings. If he’s still trying to cover things from his past with outside change what he’s holding on the inside