C366 You know you're wrong

"Now that you know you're blaming Ah Jie wrongly, and you even caught me berating you, it's fortunate that my mental fortitude is good, and that you're a slut with a sharp tongue but a rotten heart. Actually, I can understand why you acted so excessively after hearing that Ah Jie and his girlfriend had broken up." I understand Zhang Zilin's meaning