What is wrong with him?!! I know he isn't using me so why doesn't he call?

The guy I'm dating who happens to live 250 miles away bought a plane ticket for me to visit him for the weekend, the price was over �100, he didn't pester me for at all when I got there, if anyone did that, it was me!, he asked me to call him when I got back which I did. Since then I haven't heard from him, do you think he cud be waiting for my call? and also....how come he hasn't called me? I know he's very much interested....he complains I nag him bout his infrequent calling but I feel a girl deserves a phonecall every now and then....What's his game? I'm confused...