If you like him, and you're wondering why he's not calling you, it'd be a good idea to find out why. Don't get upset with him, though; have you always called the man back to thank him after he's taken you out on a date? You'd likely figure that he'd just call you and ask you out on another date if he were interested in you, right? Well, he deserves the same consideration that you would want. Remember, "do unto others." Would you expect him to get upset with you because you didn't call him?