Harry
I don't think Bellatrix can be changed. She lives for his cause and that's all that she wants. She always wanted nothing more than to belong to him and she got what she wanted. She won't go back and decide that she desires another path. It's not in her to do that.
She told me. I asked her to tell me and she did. Maybe it bothered her when she first found out what she does, but I don't believe that it bothers her now. She won't lose sleep over the fact that she was the cause of my brother's death. Bellatrix only cares about herself, her master and upholding the family name.
He used to follow them all around. I saw it. He practically worshiped Sirius and James. He was constantly by them. And he betrayed them? For him ? I don't understand why he would do something like that to his friends. He never showed any interest in the Dark Lord when I was around. None.
I didn't think it would be like this. I didn't want it to, but I'm happy you told me nonetheless.
I'm glad that I could do something right. If what I did helped you then my demise had meaning in the end.