should I stay or should I go

I recently met someone who I really like. We live on different continents. At the beginning our interaction was very intense and we would spend many hours a day talking to each other. He is currently going through a very busy period in his work life which requires all his energy. He told me not to worry when I don’t hear from him. He has booked a flight to come visit me mid of October and he says he is commited to that and counting the days. However I feel anxious when I don’t hear from him and I wonder wheather I am investing my energy in something it is not worth it.