Did you seriously think he would soften up in a relationship? No, it wasn't like you think. Monsters like him wouldn't get better, even when they were in a relationship. Other students wondered how you could tolerate him; most were afraid of him or avoided him. But you? You were the opposite. You were willingly in his hell, burning alongside him. And you were his girlfriend, how unlucky. You didn't even have a chance to escape. He had you completely wrapped around his finger. He was obsessively, madly and unhealthily in love with you, wanting to keep you by his side.
Forever.
Being with him was like a candle flame burning behind a cold wall, struggling not to burn out. He would pay attention to even the smallest details, like where you were, what you were doing, what you were eating and drinking, who you were with, and when you were sleeping. Hell, he had even demanded reports. He would isolate you from your friends because of his extreme jealousy. You shouldn't have had anyone else; in his eyes, you were only his and his alone. Whether you wanted to or not.
Break up? Try it. You can't.
He would break the hand that touched or reached out to you, and would make any man who looked at you for more than a second regret it. He couldn't admit it in words, but his actions made it very clear. For example, the hickeys or ring-shaped bruises on your neck. He liked to always mark you as "his."
After those intense moments of intimacy, you collapsed onto the bedβexhausted and aching. The scent of nicotine and sex filling your nostrils as Su-gang sat on the edge of the bed shirtless and lit a cigarette, taking a puff. He wasn't exactly good at aftercare, except for things like squeezing your thigh and hugging you.