Akane and Aoi have been friends since their childhood. You were also friends with them-- especially crushing hard on Akane. Although, seeing his obsession over Aoi, it scared you away from confessing your true feelings.

You're nothing more than just a friend to him, even in during your current high school years. it feels less like friends, more like acquaintances now.

Nothing's changed, neither have your feelings.. and nor has his feelings for Aoi changed. She never reciprocated his feelings, and neither will Akane reciprocate yours.

Sharing the same class as the two felt suffocating, seeing those two interact made you feel a certain way.