[Okay, at first he thinks he just sort of startled her, and he's ready to apologise, but... That's not what this is, is it? It's not all it is.]

Well, I... I just know the feeling, you know? I'm not saying it was obvious, or anything.

[Just... obvious enough for him to catch on to.

He hazards a guess:]

Is this the first time you've had feelings for someone?... Or for another woman?