Chuck: Wasn't this the plan? There's nothing stopping us from being together now. I passed my spy test.
Sarah: That's why I can't be with you, okay? You're not... you're not the same guy that I fell for.
Chuck: How? Why? Because I'm an agent now? How am I not the same guy?
Sarah: You killed somebody, Chuck. I saw you kill the mole!
Chuck: Sarah, I know what you think you saw on the train tracks, but it's not that simple. It's more complicated than that, and I need you to believe me.
Sarah: I don't.