"So what happened after that day then? He carry on travelling with you?" Okay, Jack was definitely jealous. The Doctor forgiving a man he travelled with. Talking fondly about him. Hmph.

Oh Jack Harkness, what's wrong with you? He thought. Getting jealous! And jealous over the Doctor of all people. How ridiculous.

"Hey! I can do enigmatic!" he said defensively. "I've had people try and write books about me I'm that enigmatic. Come on, guy from nowhere, doesn't age, doesn't die, doesn't have a real name. That's got to be a bit enigmatic, right?"