Perhaps the most important reason was the fear of Qin Yize.
If he wanted to do something to the Gu Family or had designs on them, then Qin Yize would definitely not stand idly by.
Given Qin Yize's temperament and nature, who knows what kind of storm he would stir up.
Moreover, Qin Yize was clearly the man on whom this man's fearful regards were set.
And when the Qin Family fell into decline, Qiaoqiao chose this time to leave Qin Yize, to leave the Qin Family, then the Qin Family must be extremely disappointed in her.
All the good impressions from the past would be overturned.
Perhaps everyone would hate her to death at this time,
then the Qin Family and the Gu Family really would cease to have any dealings with each other.
And at this time, leaving Qin Yize would surely cause him much heartache and disappointment.
Perhaps he would never want to see her again.
Thus, the Gu Family would lose the Qin Family as a powerful ally.