I know.

[He turns a little to look at her, sighing.]

I was raised among magicians. Secrecy is our nature, and if you tell the wrong person the wrong thing, it's a lot worse than hurt feelings.

[Nathaniel takes a deep breath. He's always been solitary- isolated from a painfully young age, unable to really rely on people or count on them for anything.]

Tell Castiel that you told me not to. And that you intervened only because you though I was going to get myself killed without you- which is pretty much the truth anyway.