The Doctor: Go to Hell.
Clara: Fair enough. Absolutely fair enough. [starts to leave]
The Doctor: Clara? You asked me what we're going to do. I told you: we're going to Hell. Or wherever it is where people die. If there is anywhere. Wherever it is, we're going to find Danny, and if it is in any way possible, we're going to bring him home. Every culture has a concept of an afterlife. I always meant to have a look around, see if I could find one.
Clara: You're going to help me?
The Doctor: Well, why wouldn't I help you?
Clara: Because of what I just did, I just...
The Doctor: You betrayed me. You betrayed our trust, you betrayed our friendship, you betrayed everything that I've ever stood for. You let me down!
Clara: Then why are you helping me?
The Doctor: Why? Do you think that I care for you so little that betraying me would make a difference?