HELP!!!!

Ok so there is this guy my friend is dating. Ok before you stop reading this isn't a stupid little 'I have a crush' thing. It's a lot different. So this guy gets so much crap all the time and he feels unwanted. He self harms and my friend recently broke up with him but just got back together with him. Ok so I've always felt kinda idk weird whenever I see the stuff he does to himself. Today I just wanted to cry. He had stuff all up and down his arm. They were all fairly deep to so that made it worse. I just I don't know I had the song it for the hurt and stuff written on my arm today again and he saw it read it smiled and said he's happy at least someone at least kinda understands. Dude I found out he's really nice (not in a weird way we ARE just friends.) But yeah I actually want to kinda help him without sounding weird but I don't really know how to without writing a song or whatever and that would sound creepy. So yeah goodnight.