I don't know if it's about him being violent. I think the guy in the song is trying to get people to pity him. He tried to commit suicide by hurting himself (the scar, the hurt back). The thing is, he never really wanted to kill himself, he just wanted attention. The innocent girl is the one that pitied him. She's being drawn in because he is lying to himself, and to everyone else about his depression.
I don't know if it's about him being violent. I think the guy in the song is trying to get people to pity him. He tried to commit suicide by hurting himself (the scar, the hurt back). The thing is, he never really wanted to kill himself, he just wanted attention. The innocent girl is the one that pitied him. She's being drawn in because he is lying to himself, and to everyone else about his depression.