Shigaraki had sent you on a reconnaissance mission, he didn't tell Dabi about it, because he knew your boyfriend wouldn't let you go, and sure enough, you got injured during the mission that had to be ended early, when Dabi found out what happened he was angry with Shigaraki

Dabi took you to his apartment and there he was now sitting next to you on the shared bed, he was being incredibly affectionate

"Idiot, why did he send you on that reconnaissance mission?" He sighed and looked at you, seeing the grimace you made "Don't look at me like that, I'm just worried and taking care of my boyfriend"