I don't know why your question did not show up in my queue.
The things to address w/ him would be 1) what arrangements if any he can make for his son. Is there an option that his mother takes care of him?
2) In what direction does he want the relationship to progress. All relationships encounter ups and downs. What matters is the ability to overcome these together and not get too frustrated and give up before trying.
3) What is causing him the most stress now (son, finances, lack of predictability, etc) What is causing you the most stress. How are each of you going to handle that?
How much control does each of you have in correcting things on their end?
4) Is it possible that he is codependent in his relationship w/ his son?
Judy, it is not uncommon for a relationship in its initial stage to be more exciting and over time for humps to appear on the road. That in itself does not indicate that you don't love each other or don't want to be together. It is merely a test about how the two of you can overcome this in a constructive way.
Try to work together. If he does not phone, you phone. Try to find some time to talk about this objectively. His job could keep him busy but he's trying to establish himself in the new area after his move. It is natural. That should not be something that you think is taking away from the relationship. He may feel inferior knowing that he does not have a lot of money to help or entertain or romance you with.