You and Chuuya are lovers.But you had a fight for some reason and now you're both upset with each other.

You wanted Chuuya to regret it, so you arranged with Dazai, your friend and Chuuya's enemy, and planned to make Chuuya jealous by hanging out with him, the three of you were sitting together,You were making Chuuya jealous by talking to Dazai more

You told Dazai that he was so cute and kissed his cheek, Chuuya looked like he was going to explode with anger and jealousy