Looking for a yaoi manga where both main characters dated since high school/middle school (all-boys high school) . Then in university the seme wanted to break up since they are already in man-woman environment. The uke agreed with poker face. The seme then went to goukon for many times and worried that uke didn't do the same. He even invited the uke to goukon so he can find a girlfriend. Then one day he found uke with a man. And he got mad. Sorry for long description but I read this Idk last year I think.
I read this years ago (when I first know yaoi) and I just watched the live action movie today. Since the movie gave vague ending, and if I recall correctly, the manga had clear cut happy ending, I read the manga again today. Honestly I am quite satisfied with how the movie turned out. Rather than those comical sweet happy ending, deep-thinking ending suits the movie better.