This guy asked me over for dinner and?

So this guy asked me over to his house for dinner a few days ago. The next day he told me he didn't know it but is on call for his job. I asked if he wanted to cancel and he said he would have to see what the schedule is like and he would let me know. So last night he told me he wouldn't know until today and now it is dinner time date night and I haven't heard from him at all. We have been talking on facebook only and he is an old friend, but we haven't seen each other in a while. I am confused. Why wouldn't he let me know? It's still kinda early, but he should have been home from work a up to 2 hrs ago. What do you think is going on? What should I do?