1. Two classmates reunited and talk about the old days. One or both realized they were mutually in love but it is too late to change anything now.
2. Girls love boy but it was unrequited. When boy finally falls in love with girl, she has already moved on with someone else. I know many shoujo have similar plot line. However, they are usually told from the girl's perspective.
I would like the stories to be told from the perspective of the one who missed the chance of love. I want to feel the regretful feelings. I tried to look for it among the categories but there was none.
I recently read this manga: Hatsukoi wa Marude Yaiba no You ni https://www.mangaupdates.com/series.html?id=70447
The manga did not focus on regretful love but near the end when
Spoiler (mouse over to view)
The Dogged nice guy confesses to the main girl and she realized she could have dated him instead of getting into this messy marriage
is exactly the kind of situation and feel I am looking for. P/S not interested in shounen ai/ shoujo ai/ hentai (smut is ok though)