"But... everything's happy," Cassandra protested. "Everything's fine... can't you just leave me?"

She's not really all that hopeful. Meddling seemed to be his job, which he proves by ordering her to leave Rose's body, claiming that she's lived long enough. Long enough? Who's he to judge. She starts to cry, protesting that she's not ready, that she doesn't want to die. She begs for his help, but even as she catches something like sympathy in his eyes, he's adamant that he can't.

Then a familiar voice brings hope back.

"Mistress!"

It's her Chip. Still alive. He'll help. He has to.