I don't remember, did they show why did they breack up the first time?

From what I remember, it was because the first time they had sex, which was in school, ritsu told takano he loved him and takano laughed, which made ritsu insecure or something like that, so he left

But i haven’t read/watched in years so my memory is a little foggy

Thank you :) yea i can't belive it has been 10 years sins chapter 1. I can't wait for them to say the official "i love you"

They already did