[He won't tell her he has been here the whole time waiting for her to come out...]

I was simply waiting for you, of course! Nothing more than that.

[...He'll just say that. And entirely casually, as if there's absolutely nothing wrong with it. He can't help but be humored by her reaction though, which is why his smile widens even more earnestly, and he laughs lightly.]

Did I startle you with my dashing smile? I'm sorry; that much was not my intent.