dazai snd you both knew that you had some kind of issues. You never got checked for what it was though, all you knew was that whatever it was, you despised it to the core. You havent lashed out in a while, but today you already were extremely tense and dazai made a sensitive joke that hit you a bit too hard than it should have and the only thing he saw last before u lashed out was your face that already looked like he just pulled your last straw.