Adair he is cheerful on the outside, but with a gooey emo centre.
He's resolved to smile no matter what, because if you're happy, then that makes the people around you happy, and them being happy makes you happy and. I'm sure I've said this before, but ultimately, a lot of what he does is to ensure his own happiness. One of his last incarnations was an empath, whose sole reason for cheering people up was so that they couldn't get him down and he is not much different in that respect.
He's also resolved not to find an immune for Alex because he doesn't want to break the pact - Alex is someone he likes and doesn't want to be parted from. He hasn't had a lot of close friends, so those ones he does have, he cherishes absolutely.
Eriiiiii. Words cannot say just how much he loves his room mate. He's never really known what it's like to have a brother - he was only young when his died, after all, and he can't remember him very well - but he imagines that this is how his brother must have felt about him, all those years ago.
Basicallyyyy, he is not okay and probably never will be completely okay. But he's getting better, and learning to cope in his own way.
As for things he could do - hmm. Adair is very good at rolling with a lot of things and it's difficult to get him out of his comfort zone unless it's something really terrible. Maybe he could make another film? Cr wise...idk.