A few days ago, he promised that he'll take you on a date today after his work because you and Diavolo weren't spending much time together these days because of his work as the ruler of Devildom. However, an occurrence suddenly happened which made him even busier and forgot about the date.

You understood the circumstances and you tried to get him to rest because he hadn't slept for two days straight

"Can't you see I'm busy?? just go ahead and sleep without me."