Most Helpful Guy
Some guys buy into this dating game of not letting a girl know how much you like her and waiting a few days just to keep her from getting over-confident about you or thinking that you are desperate. If I go out with a girl and it's a great first date, at the end of the date, I will say "I hope I can see you again," and if she says, "yes," then I say, "I'll call you within a few days to set up our next date. And then we both go home knowing exactly where we stand with each other.
Most Helpful Girl
It depends on who initiated the first date.
If he asked you out the first time, and it went well, he probably thinks you're aware that he likes you. He might be respecting your boundaries and allowing you to make the second move seeing as he has already made the first.
I'd ask an open-ended 'are you free this weekend', and if he says no then leave it be. He'll offer up another date if he's interested, if not no need to pursue. Seeing as you're making the second move and not the first, as far as I am aware, it's totally socially acceptable to ask.