My miserable life of cheating

This was a story of a post-80s generation who had a cheat at the beginning, but he didn’t have any sparks or lightning along the way. Instead, he still died. The time span of the story was relatively long, and the author tried not to drag the plot as much as possible. This book was written from a man’s perspective, so although there were many female characters, there was no real female lead. If you don’t like it, please don’t disturb it.