I think this song is about someone who always feels limited... he doesn't want to be this person whose always been told "how far he would not go", so he wants his inner self to take possesion of who he is, "taking away everything he is", so that his true self can be the only thing left...

this song, in my opinion, is about someone who has a personality dissorder.... killing the one he loves, and feeling regret of his action, trying to undo it...
I don't say it's psychopathy nor sociopathy, because of the mere feeling of regret... maybe bipolar dissorder? maybe...