Jack shrugged, taking a larger drink of his juice. "You just reacted, Doctor." He reached out to rest his hand on the Doctor's shoulder again, even knowing that he'd probably flinch again. "Like you are now, only you had the TARDIS. You could run as far and as fast as you wanted to, needed to."
He sighed, shifting his hand to the Doctor's cheek a moment. "Don't start feeling guilty over leaving him behind, not yet, Doctor. You said you'd just come from there, just left the Game Station. You don't know that your Jack is going to be a century and more without you." He smiled, leaning in to give the Doctor a swift and fairly chaste kiss.
"You could always go back and pick him up before he has a chance to even register that you've left him behind. After taking as long as you need to get over the fact he's a fixed point in space and time."