classmate

okay, so ive written about him before. (see "classmate that is hard to show God's love to" and "S'ambrosia")
just to clear this up, i DONT like this guy. i love him as an enemy/friend/classmate/brother. its complicated. anyways, heres the story.
so my classmate was living in sin. then, out of obligation, i started to pray for him. then i started to want to pray for him. he started to change. i knew God was softening his heart. then, a few weeks ago, he became a Christian!!! my friend and i were SO happy! we cried and thanked God. then, earlier this week, we found out that he recently started cutting himself. we told our Bible teacher about it, and he said he would pray about it and try to help. then the we found out that my classmate's friends cut themselves, have drugs, and are trying to kill themselves. (in the past, even until recently, he has had many goth girlfriends. he JUST turned 13.) we then learned that he punched this other boy in the face and got kicked out of the elective he was in. then, when we thought it couldnt get any worse. we found out that he smokes. i almost crumbled in tears. i couldnt take it. "WHY????" i cried out to God, "WHY???" we told our teacher the whole story. then he got suspended for punching the other boy. now hes suspended, but were so afraid for his safety, his purity, and even his life. he said over and over, "i hate myself, i hate my life, i hate myself, i hate my life...." etc. yesterday, i saw the scars on his arm. he is either not a real CHristian, doesnt understand, or just isnt living out his faith. idk which one, but im discouraged. what should we do??? comment and PRAY!!!!!!!!!