He's trying to show something, that he can take care of himself, give himself what he needs or thinks he needs. He defined it, planned it and will see how it all works. Even if you're not there, lwb, you are there. You've been with him too long not to be hardwired into his brain. You'll be missed.
AND.. the most important birthday celebration will be with 'his girls'
Your H sounds like mine. Before he turned 30 he flatly stated he did not want a party, no way, no how. He repeated it several times and I got the message. NO PARTY! The day of b'day he rolls over and says.. Okay, you can admit it. I know you're having a surprise party for me tonight.
Uhh, no I'm not.
He keeps asking me, I keep saying no and he leaves to go to work, upset that there is no party.
The lesson I learned was that even if he said he didn't want something, it didn't mean he didn't want it. He just didn't know how to give it to himself.
And that my friend, is a skill everyone needs to learn.