Your question reminded me of my daughter when she liked a guy but when he called he had so little to say. I told her to keep a list of things to ask him, learn how to keep things going by his answers and when he stopped talking to be ready with another question from your list.

This guy liked my daughter, even told her years later that she was always the one girl he could talk to. He calls her every year on her birthday, and she had learned long ago, "how to keep the conversation going". It's about learning that's all. And believe me, you are not the only one trying to figure that out.