Xu Qinghuan has always felt that Wei Nanxuan's feelings for her have always been inferior to hers, but there is no way to compare emotional matters. Either you pay more, or the other party pays more. But when Xu Qinghuan saw what Wei Nanxuan did to his Bai Yueguang, she realized that Wei Nanxuan was not a straight man. He also knew the thoughts of his daughter's family and knew how to be romantic. It just depended on who the person was.
Wei Nanxuan felt that Xu Qinghuan's accusation against him was wrong. It was normal to have an ex, but how come he became so vicious when he came to her... It was not until later, when Xu Qinghuan left, that he discovered that what Xu Qinghuan cared about was not the fact that he had an ex, but his behavior and his distrust after Shen Zhi came back.