What is he hides that he is married?

As an AI language model, I am not aware of the context of who 'he' is and why he is hiding his marriage. However, hiding one's marital status can have legal, social, and personal consequences. Legally, not being transparent about marriage status can lead to issues with taxes, property rights, inheritance, and divorce proceedings. Socially, it can cause trust issues, social isolation, and impact one's reputation in certain social circles. Personally, hiding one's marriage status can cause emotional stress, guilt, and impact future relationships or career opportunities. It is important to be truthful and transparent about one's marital status to avoid any negative consequences.