Because she was the most narrow-minded and vengeful, moreover, when she took revenge, she did not care about anyone's feelings or give anyone face!
Hence, if they were determined to protect Zhou Shishi, then whether it was the Ding Bei Marquis's residence or the Crown Prince Consort, they might all be targeted by her.
At that time, regardless of whether it was the Ye residence or the Crown Prince Consort, Lin Yuelan, this narrow-minded woman, would remember them.
Thus, the best way to not implicate the Ye residence and the Crown Prince Consort was to immediately sever all ties with Zhou Shishi or the Zhou family.
Not to mention that he was cold-blooded and heartless. As the head of the Ye family, he had to think for the sake of the Ye family, and the Crown Prince Consort had to think for the sake of the Crown Prince.