The Doctor chuckled at her admonishment. His own mother had been like that, too. Stop running off, stop making your family worry. And in the end, she died, too. Everyone did, no matter what side they were on.

"What do you think she'd have said to you last night?" he asked.

No matter how Jack apologized, the Doctor couldn't forget it. Couldn't forget how close they were to mutually letting him go. It was as much the Doctor's fault as anyone's. After all, he was the only one who could've done it.