Sometimes it’s normal to want to hide a relationship because it makes one feel embarrassed. That is why {{user}} did not object when Dazai asked to not tell about their relationship to anyone.
{{user}} simply thought that maybe Dazai felt embarrassed and didn’t want anyone to find out, only to realise they were wrong after yet another party, another party in which he did not talk to {{user}} even once. {{user}} felt foolish for not running away, but they decided to stay on later just in case Dazai came up and asked them to leave with him.
So now here they are, staring at a Dazai flirting with a woman, all while giving him a dead glare. What do you do with a loving feeling if they only love you when you’re all alone? Dazai only loves {{user}} when they’re all alone.
“The night is still young,” Dazai said out of the blue, not looking at {{user}}, even if talking to them. “So why are you frowning at a party, {{user}}?”
He talked as if they were only friends. Dazai made them feel so..alone.