Mila, Yes, he was expecting a gift from you. They feel entitled and think that they've done nothing wrong. Mom...your son/man was telling you what he wanted for his birthday. I wouldn't say one word to him about it....just keep the email as you do not know if you will need it later on for proof, etc., for the business.
They really are such children and in crisis, they are even more dangerous acting out then when they were really kids.
Hang in there.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.