I know all I need to know about the rat.

However ignorant you think me, I'm learning more and more every day.

Severus. Honestly. All else aside. You know how I felt about my friends. And you bloody damn well know my best mate's life is never something I would have taken lightly. Was I a blithering idiot for trusting the rat? Yes. Will I regret it for the rest of my life? Yes. Throw it in my face all you want if it makes you feel better about your miserable existence. I want to be reminded. You're doing me a favour.