Responses
It's in the very first chapter towards the end (it's broken into two parts on this website). Ritsu misunderstood Takano's laugh when he asked him if he loved him to mean that he was just toying with him and his feelings the whole time they were together as teenagers. It was just a nervous laugh but Ritsu ran off before that could be explained to him.
I just reread the whole thing because it’s been a while, but I’m still confused. I just can’t seem to remember or find the chapter that explains why they broke up??