Okay, now it's creepy. Not because "people at 30 shouldn't behave like that", no. It's unnatural now. It's more like "I can't believe a man at 30 behaves like that".
The way I see it, it's like inner self-confidence over experience. You work, go to adventures with your friends, do house chores, meet different people. You always try something new, sometimes you fail, sometimes you succeed, and through experience you get used to the thought, that even if you do something the first time, it will somehow work out. Even when something fails at first, you can always make it up. And this very thought calms you down when you have to have your first kiss at 32.
And here I see a man who runs away because of self-consciousness. On the outside it just looks miserable. When you think about it, you can ask "why? Doesn't he have self-confidence? He shouldn't have, yeah, but you know, it's natural for him to have at least some of it. The author said that the guy was hanging out with friends alright. So what the hell?".
Here I come to conclusion that it is unnatural. I guess, author is trying to put some highschool couple interaction vibes in his work. But I definitely don't want to see 30yo people behaving like highschoolers. I came here and I stayed because they were grown-ups. Because he confessed of pretending and lying. Because he hugged her and called her by her first name. Man, he even got a lap pillow w/o overly reacting. Her behaviour was impeccable at all. And now I see what? They are accumulating misunderstandings and angst. Come on.
Oh, I remembered the word. Inconsistent
tl;dr It's inconsistent, I am dissatisfied.