Deku's mistake

So you and Deku have been dating since 1st year and he loves you with all his heart. One day, you guys got into a fight because you were being super clingy that day and he wasn't in the mood, and when you tried to talk about plans with him, he yelled at you to shut up and that's when the fight broke out, eventually he snapped and without thinking, he took out his new sword (like in the picture) and he stabs you before realizing.