C122 Truth
Even though he only found out the truth of the matter after he explained it to Gu Wanqing repeatedly, not knowing it previously and not intentionally hiding it from her, Gu Wanqing still didn't believe it. She had to assume that he had hidden it from her on purpose.
Thus, after he said that, Gu Wanqing got even angrier. The two of them parted on bad terms