When seme (or male lead if it's shoujo/josei manga) regretting all the bad thing he has done (especially to his significant other) and trying to make amend of his wrongdoings. Some of the list has uke that is very forgiving, never forgive or died. I don't mind whichever ending, it's just the feeling of regret, from doing bad things or taking things for granted.
Most in the list are yaoi/shounen-ai genre, that's why I used term 'seme'. Feel free to add if you have anything similar in mind.
୧••୨ ========== Feel Free To Suggest Anything==========୧••୨
List here mainly includes the mangas where uke/seme had previous heart-break,unrequited love ,Broken souls- aka the character who lost their will & other past trauma...which gets better after meeting their MR Right
-where feelings remains unrequited
-where new lover comes
-where they ends up with the person they loved first
- Past trauma
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-Reincarnation, Transmigration
-Reincarnated in Another World
-Reincarnated in a Game World
-Reincarnated in a Book World
-Reincarnated as the Villainess/Villain
-Reincarnated as a Side/Mob Character
-Reincarnated in The Past/Future
-Time Travel, Time Rewind, Regression
-Transported to Another World
-Female Protagonist
PART 3:https://www.mangago.me/home/mangalist/682647/
PART 4:https://www.mangago.me/home/mangalist/1494844/
PART 6:https://www.mangago.me/home/mangalist/3193687/