Looking for a yaoi manga

I'm looking for a yaoi manga where the uke is a teacher and a seme just started being a teacher. In their childhood the uke was an out-going kid and seems like a leader of the group. A "girl" was always hanging out with them (if I remember correctly). The uke talked to the girl about not letting the girl hang out with them anymore and the "girl" cried while the friends ran over to him and blamed the young uke for making a girl cry. Some days later the girl moved away leaving the young uke changing himself to be more quieter. Throughout the manga, the uke realized that the girl that he used to hangout with with a boy (the seme). In the past, the uke used to be a bold kid that he acts like a leader and stuff but now, in the present, he acts more like a tsundere?? I don't know if that's the right word for it. I think this is all of the details that I remembered about this yaoi manga>.<