I think hes trying to say he fell in love once but it went wrong and it still haunts him, like a ghost. And he can feel it under his skin, which is why he cut himself, to try to get that feeling to go away. yet he remained the same, a "vagrant lover prisoner" and his rectifier was his past lover, who broke his heart. rectify meaning to make a correction by removing the error, him being the error. this obviously hurt him and if this person would come back to him, then the ghosts would all go away. unfortunately, this person probably won't.
I think hes trying to say he fell in love once but it went wrong and it still haunts him, like a ghost. And he can feel it under his skin, which is why he cut himself, to try to get that feeling to go away. yet he remained the same, a "vagrant lover prisoner" and his rectifier was his past lover, who broke his heart. rectify meaning to make a correction by removing the error, him being the error. this obviously hurt him and if this person would come back to him, then the ghosts would all go away. unfortunately, this person probably won't.