For such a person as you mentioned, it is not easy to judge his future life direction. Judging from your description of him, I am personally pessimistic about his future "no longer paying attention" and "changing for a true love". Both moral quality and self-cultivation have great defects. You know, some fundamental defects are hard to correct all your life.
Of course, the return of the prodigal son is something to be happy about, and we should expect him to change. But if you like such people, that's another matter. Get ready and think about whether it's worth it.