What do you think this guy is doing? I mean are you aware that he's willing to date you or do you think he's just trying to be friends?
Now suppose -- you like the guy. What will do you after he runs out of questions; will you ask about him? Or tell him more about yourself or extend the discussions so he can ask more questions?
By quiet I don't mean he doesn't talk at all, I mean if the girl is not responding in detail, i.e. not giving him enough surface to grip on and ask questions about her then he'll be able to concoct only 2 or 3 questions.