@big67 No, I get your points! The ending you describe would definitely would more realistic, he doesn’t give off a vibe that he’s interested in her, and certain events (in Chapter 4 especially) are pure fiction. I think people (myself included) find this manga more realistic in a purely *relative* sense, compared to some other shoujo/josei mangas.
So like, in most shoujo/josei, usually after the confession/big discovery they’d get together or one or both of the main characters would continue to be completely delusional. By this point, she seems to accept the rejection and recognizes that nothing is gonna come out it (in the final two chapters, she comes across as even more reasonable in my opinion). However, it seems normal to have a crush on someone, or retain feelings, even after being rejected. I think most people can relate to liking someone who doesn’t like them back at some points in their lives. After Chapter 4, I’d also say that her “pursuing” behavior is relatively tame. She just tries to paint herself in a positive light and doesn’t deliberately take any further actions to get closer to him. I think the slower pacing (how everything happens across weeks/months rather than days) is a bit more realistic too.