[There she goes again, doing more for him than she should. He doesn't thank her again; she's got to know by now that he appreciates that she cares enough to not leave him to his own devices (even if he thinks that killing himself would be an easy solution to all of this). She's good to him.
Good enough to warrant more than a thank you, anyway. After a quiet moment, Nathan meets Kitty's eyes.] If something happens and someone gets hurt, promise you won't feel like it's your fault?