So Wu Zeitian stabs Qi Zheng in the hearts because she knows that he thinks of her as property to be discarded....

This happens after said fight

If she refuses to see reason, he shall do it for her. He has been fat too lenient with her, too tolerant of her insolence. [...] Sentiment weakened him. For the first time in his life, he understands the logic behind binding the feet of a woman. [...] He calls for a staffer to summon [...] her (MCs) precious lady friends . So long as he holds their lives in his hands, she is bound to return to him. She'll come home, even if he has to break her legs and drag her. After all, his son cannot grow up without a mother.

Yoooo wtf. This dude is fucked up so much, kinda sad howtgis walking contradiction is leading the revolution...