Nvm. Found it.
Spoiler
The guy wasn't able to fully move on. The guy started paying money to the husband of the girl he cheated with ( yes the girl was married ) and the husband even demanded that the guy pay it himself everytime. Then, as a working person, he still wasn't able to fully move on while the girl is loving her work and has now moved on. She even doesn't have that much of a problem calling the guy his ex boyfriend when her colleague friend asked abt it. It was four years after the break up and he finally finished paying the money while the married couple finally had a child. Then, at 38 years old of the guy, the girl was already married (even sent a card with pic to the guy WHAHAHAHA) and the guy still has some regrets. It ended without any real conclusion for the guy.
There was this ntr story (straight couple) i read about a guy who now is in an ldr with his gf. On the apartment building he live in, he have a girl neighbor and things happen and he started cheating with her. I wanna find it because the latest chapter i read on it before, the guy wanted to fix things with the girl while the girl had enough already and asked to break up. Wanna see what happened next...