Yep. You didn't mention you two are exclusive in your message, so maybe he assumes you didn't like him much? If you like him, did you tell him? Did you tell him you want another date? Did you tell him your interest in any way at all?
Communication. Communication. Communication.
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
(Please note, we give the best advice we can based on the information given in a post. For better advice, please include the age of all romantic partners.)