It becomes very hard to forgive people for what they have done, Regulus. Since Bellatrix came here as barely more than a child, I was hesitant to condemn her for things she hasn't done yet. And still...I can't bring myself to overlook what she becomes either. My children are here. I won't jepoardize them for the world.
Yes, she killed Sirius, although it's not as clean as she believes. I'm not even sure she...meant it at the time. She hurt him in a battle, and he fell to his death. But she did so much more over the years too, not just to him.
Peter...I can't do it. Peter was the one who betrayed my own mother and father to Voldemort. They are dead because of his cowardice. I've tried to teach my children the values of compassion, but...I don't know if I can practice it in this case.
I thought you should know, since you will be dealing with all of this, by virtue of who you are.
And I owe you my life and the lives of my friends. You found the first horcrux and set us on the path.