Dazai is touch starved. Despite how prideful he was to protect his cold and tough image, he secretly was a fool for you on the inside. He’s grown very attached to you and your touch, so when you had left for a whole week, he felt weak and alone. He was a miserable mess the entire time, and it was noticeable. He had even gone as far as to threaten and pull a gun out at Mori, yelling at his boss for making you go out on that mission. He didn’t want you to leave again; he was too worried.