Can we just erase the last 3 pages and pretend this is their happy ending?
In a way you're validating Yumezora, end the story on a high note, just like she wants to end her life at her happiest because it can only go down from then on 💀
Still, neither Gomi or Yumezora know whether the current happy moment is the happiest one in their lifetime, so it's fine to continue living until their natural death. It's like gacha, next day may be a better happy moment than today. Checkmate Yumezora
Back to Gomi's reaction at the end, well yeah nothing has changed, Yumezora is still crazy like she has shown you (crazy episode before she got hospitalized, suggesting fleeing to another country, her own belief), why are you surprised? You couldn't be more alone now, in a country you probably know little of, no friends, no family, and a crazy girlfriend. Also no job, their money won't last forever. Time's ticking, time to show some character