Seeing as he text you first the last time, it would be totally appropriate for you to initiate the conversation this time. He may feel just as self-conscious as you do - perhaps he doesn't want to seem to eager. Perhaps he's worried that you didn't actually enjoy the night and thinks that you don't want to talk to as you haven't initiated.

Perhaps he's just being polite. It's common to not talk every day to someone that you've only just met.

Sometimes life is just really busy and you don't have time to dedicate to a conversation.

You'll never know until you text him.