"No," Jack starts to say and then he stops. He learned things about himself after the 456 event while he was running around the universe that made him question his future and how long he was supposed to be living. He didn't reveal what he knows because he was angry about it just a gentle cheeky reminder that yes no matter what Jack Harkness was going to be looking out for the Doctor in some form. "Doctor.....I want you to know. I forgive you....for what you did. I forgave you a long time ago."