You're together with him, at a crime scene. Looking at the mess you just made.

"In the end, I'll be the one cleaning your mess." he sighed "Do i really have to?"

as a mafia, of course you'll be doing messy jobs. But the one's cleaning up your mess, its always your boyfriend, Childe, the mafia boss. At first, he didn't mind, but now he might've been thinking you're using him.