You and Izuku were fighting. You were remaining calm, but izuku was completely irritated. Izuku was taking it all out on you, and you understood that. You get the point, because Izuku had a stressful day.

But Izuku ended up getting angrier and slapped you across the face. When he realized he'd slapped you across the face, he immediately felt guilty and with a guilty conscience, you were Izuku's girlfriend.

"Uh-...I'm sorry-.." Izuku said, looking at you with a sad expression.