I think this song is about a relationship that went bad, and Ben is blaming it on the other person. He is asking her to bleed so that he knows that she is a real person who has emotions, because at the moment he thinks she is some "evil" person(the hell reference)--he can't believe any person with feeling could actually do that to him, especially when she apparently acted like she cared for him (Good lovers make great enemies).
I think this song is about a relationship that went bad, and Ben is blaming it on the other person. He is asking her to bleed so that he knows that she is a real person who has emotions, because at the moment he thinks she is some "evil" person(the hell reference)--he can't believe any person with feeling could actually do that to him, especially when she apparently acted like she cared for him (Good lovers make great enemies).