This chapter did heavily play into the idea of him playing the self sacrifice card being the only possible way for this to go tho. It isn't like he has a choice either.
He himself realized that he is not okay with his crush being shared with the whole country and that her dream seemed more important to her since she immediately shifted gear and left him to dry on his own (we clearly know it was peer pressure and circumstances but from his struggling adolescent pov).
Her initiating a meeting and hug clearly will show him otherwise but she didn't tell him until then (full week later)
I won't call what is happening bad or bash the series for doing the most usual and formulaic tried and tested stuff. But the author is pushing waaay too hard on the fact that this is the girls' story and that they have pretty much 99% of all agency and make the choices, even if it makes sense with them being the protagonists.
Like, you have this guy trying his hardest to progress and solve their relationship but it still feels unbalanced and anything but alive and organic imo. I kinda feel that way about all of the guys. As if they are cardboard cutouts waiting to be allowed to act.
It's interesting you bring up the seeming lack of agency for the boys in this series - because I think there's an argument that it's simply a mirror of how so many series tend to go, when it's the guy who's the protagonist, chasing the girl. But flipping the genders like this,
and having four different stories playing out, really drives home that perception of lopsidedness.
(That might be why Chifuyu getting into that yuri-baiting situation annoys me. The one who will ostensibly lose there is the girl who's actually being proactive, even if by comparison - but the boy will likely win, as passive as he was for so long, comparatively.)
But I guess we'll see. Looking back on it more, I think you're correct, that he
will try to push her away and tell her to chase her dream, because as you said - from his perspective, she just fully bounced and got entirely immersed in this Idol Child business.
So at that point I think I, too, would just go "yeah, you've made your choice, best of luck" if I were in his shoes and with his mindset. He's already struggling so much even as he's trying, and now she's the darling of the whole school, with other guys "checking out her photos" (which we all know what that insinuates). From his POV, she's made her choice in that week's time.
If it's gonna work out between them, she can't stutter or falter, or I suspect he
will fall on his sword to see her dream realized.