I’m sorry you fell.
I’m even more sorry that you fell for him. It’s no easy thing, to be an angel in love with a human. I’m sorry that I have any idea what you’re feeling at all. You were right before. Emotions…feelings…they are dangerous temptations. I barely scratched the surface of human emotion, but you…you were plunged into them headfirst from the very moment you laid hand on Dean Winchester.
I’m sorry for the pain it must cause you to be unable to help him. But I can’t let you do this. I can’t let you have Metatron. Castiel, you have left a trail of broken things behind you in your attempts to protect him, and you wouldn’t hesitate to add the Scribe to the wreckage. Not if it would save him. Because you’re here today, not as an angel doing his duty, but as a man protecting the one he loves. I’m sorry, Castiel.