Cao Xueping blamed Fan Meilin for ruining his life and he blamed Luo Huian for rescuing that mer. If she had not married him, then he would have more than one way to deal with the Fan family and Fan Meilin. After all, the Cao family was stronger and more well connected than the Fan family.
But then Mother Fan reached out to the Luo family and arranged a marriage with Luo Huian, causing Fan Meilin this mer to escape his clutches. If he had known that it would become this difficult to touch Fan Meilin, then he would have dealt with him right away.
Back then he was too conceited and arrogant. He naively believed that even if he were to leave Fan Meilin alive, he could win the heart of his wife. After all, he was better than Fan Meilin in every term; if not, then Liao Hong would not have chosen to marry him but would have married Fan Meilin.
However, it was only after marrying Liao Hong that he realised what kind of mark Fan Meilin had left on his wife.