Why's that? Afraid of spoiling me? [The irony is self-evident here. He's reached the end of his road, as far as he's aware, so even the Time Master Rip Hunter himself has admitted that it's pretty futile to keep him in the dark about anything.]

Or have you joined a girl band and sold out completely, because if you're embarrassed to tell me, relax. I don't judge.

[Obviously a joke, but there's some seriousness to his tone for those last three words.

He doesn't judge.

Not her, at least.]