The lack of an answer spoke more than any words might've. He ruined Jack in so many ways. Leaving him. Leaving him again. And again. And dying. He remembered once upon a time Jack would drink martinis and dance and laugh. Now, they sat here, two old and lonely people, and tried to keep themselves together.

It was the Doctor's fault.

"Go ahead and sleep," he offered Jack, quietly. "I'll still be here. I promise."