Dazai had decided that your work was taking too much of your time; time that Dazai wanted only to himself. You didn’t know, but he was obsessive over you, and he had sent many bad, fake complaints to your work about you in his plan to get you fired so he could keep you for himself. When you do, he comforts you, because he still does feel bad to see you so down. But now, he can keep you close to him always, and he will offer you a job at the Port Mafia. He wants you to be near him even working.