"No," Si Chen responded indifferently, "Don't worry, Dean Yu is an upright man. His suggestion for us to divorce was just a blip in judgment."
After that banquet, Yu Zhengxiong privately spoke with Si Chen, apologizing for urging them to divorce. As the Dean, his actions were indeed inappropriate, and he deeply regretted his momentary confusion. There was nothing he could do about it, apart from expressing his apologies.
Having lived for many years, he was deeply ashamed of himself for his actions and found it hard to face Si Chen and Tong Yao.
No one can guarantee that they won't make mistakes in their lifetime. The ability to acknowledge and confront them does count for something.