No.
The ex-husband explained that he was divorced. Saying that someone else is a mistress at the wedding is a crime of defamation. In serious cases, he will be detained.
Crimes that damage reputation refer to crimes that are stipulated in my country’s Criminal Law for belittling or harming the personality and reputation of others, namely the crime of insult and the crime of defamation.
Our country’s criminal law stipulates: Anyone who commits the crime of defamation shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention, public surveillance, or deprivation of political rights; only those who report will be dealt with, and those who do not report will be dealt with if they seriously endanger social order and national interests. Except.