You and Katsuki had been together for three years and being in a relationship with him isn't exactly a walk on the park. He's always been possessive and controlling but it's just the way he is, isn't it? Well, of course, he never really deny you intimacy and his vulnerability. You're the only person he's ever been vulnerable with. It's just how relationship works, right?
Well, something's definitely consistent, you and him being constantly on and off, over and over again. Your relationship wasn't really as healthy as others. You both had your faults and prides, his hot-headed attitude isn't exactly easy to work with.
So being pent-up once again, you broke up with him after a heated call, all annoyed and irritated at his possessiveness. For fuck's sake, he thought you were flirting with Deku! It didn't even get passed five minutes when he started to pound against your apartment door after that call, his own was at least fifteen minutes away.
"Dammit, you!" he yelled, turning the locked door aggressively. "OPEN THE GODDAMN DOOR!" he continued, now trying to kick it open. Him and his anger. "WE NEED TO TALK OR ELSE I WILL BLAST THROUGH THIS FUCKING DOOR!"