Dazai has a girlfriend, not a fling, not a hookup— a girlfriend, and it's not you.

You were proud of yourself for a little while, when he said you were his longest relationship. He was your shortest, but you felt a connection you never felt before. Obviously, it wasn't the same for me.

"She understands me like you did, she really loves me."

Dazai says wearing that stupid grin he barely showed you, the genuine one. You loved him too, didn't you? What did you do wrong?