I think u misunderstood it... Susha's king has insecurity over fu yixiao because of her daughter.. They thought king jiashi has feelings for fu yixiao.. Actually it looks like he has feelings for fu yixiao.. He didn't want to leave her in Susha..He has difficulties over love because of his feelings for rao ran... Rao ran was murdered by emperor and empress and had to withdraw from ascending throne.. So he didn't accept fu yixiao's feelings(u will know in next chapters)...