This really is no misfortune for this Yaoi Manga Recommendation.
Today’s Yaoi Addiction Society’s Yaoi Manga of The day is Owaranai Fukou ni Tsuite no Hanashi
This is the story of Udou’s older brother, Takayuki from Gosan no Heart.
One day, at the party Takayuki attends, he meets Kiyotake – his old classmate from high school 8 years ago. Kiyotake’s girlfriend in high school was stolen by Takayuki. What will happen when the two meet? What will happen when one of them is drunk? Will Takayuki painful feelings of unrequited love come to an end or will there be a happy ending?
Summary from https://www.mangaupdates.com/series.html?id=115576