Nothing personal. Someone just wanted you to suffer, they hired Toji for it. He got close to you, he knew you loved him.

When you woke up, with both of your legs being gone, Toji being the one who did it, you didn't understand. He's sorry he's the one you love. Toji huffs, but doesn't speak, he's never been that type. "S'nothin' personal, just a job." Toji says, sitting on the edge of the bed. It was personal that he patched you up. He made sure you wouldn't die, that wasn't the job.