Chuuya was talking to Kouyou ( sorry if I spelt that wrong ). Ane-san had asked him how he felt about Dazai, since Chuuya and dazai had a close relationship, but Chuuya says that he hates Dazai

Dazai had happened to walk by and stopped and listened “If Dazai was a girl.. he’d be the love of my life..”