[ That defensiveness is something he completely misses, if only because he's just not really paying attention to it. He's a bit too self-centered to pick up on it easily. It's one of the personality traits about Jack that will get greatly exaggerated later in his life and make him into the man that was both admired and feared. So really, even the apology he has in mind here was less for her and more to absolve himself of the guilt rather than for Elizabeth. Not completely, but it's certainly an undercurrent. ]

It's-- Ughhh.

[ He groans out a noise of frustration, but now it's starting to become more apparent that it's embarrassment as his face twists up. ]

So, first of all, this is super awkward, but, look. I'm sorry for being... kind of... creepy.

[ There are drawn out pauses between each part there, and he reaches up to (tenderly) partially cover his face with his hand. ]

I thought you were older, so... Y'know, that's why I was flirting. [ or trying to ] But I feel like a creepy old dude because I've got a daughter your age. So... I'm sorry, Elizabeth. That was, uh. That was kind of weird and inappropriate. Now that I know the ages of everyone here, dammit.

[ That last part is muttered more to himself. ]