She was originally supposed to marry him, but instead she married his brother who he hated so much. He framed her
He used other means to get her back, but he didn't cherish her. He just used her as a tool for his revenge. He deceived, insulted and tortured her again and again, just to make his brother sad and miserable. He never thought that she would gradually fall in love with him, but he still wanted to use her and had no other intention.