I don't think it has anything to do with cutting yourself. What I get from the song is that he's knows about her being with other guys hence the title of the song being "where have those hands been". And how he misses what they had in the past, at first he starts out feeling bad for himself, then it turns into anger, wanting her to feel the pain he does. But he still wants her back, feeling like he's the only person for her; that no other guy but himself can fully understand her
I don't think it has anything to do with cutting yourself. What I get from the song is that he's knows about her being with other guys hence the title of the song being "where have those hands been". And how he misses what they had in the past, at first he starts out feeling bad for himself, then it turns into anger, wanting her to feel the pain he does. But he still wants her back, feeling like he's the only person for her; that no other guy but himself can fully understand her