There's a part of her that wants to tell him to wait, to stay, to keep her company if nothing else. He's the closest thing she has to part of home, here, and that means that he must understand things about her that no one else really will - but that's stupid, so she buries it deep, so deep she doesn't have to feel it.

But what would even happen if she did ask him to stay? It's not like they would have a chat over tea and become best friends. It's not like she would matter, beyond her ability to decide whether to hurt people or not. It's not like he would actually care.

"Good," she echoes, and if he wants to leave - then he can leave, and she won't stop him.