Legal Question in Civil Rights Law in Texas

No, it isn't illegal to tell the truth but you should really think about the implications of what you are considering. You will definitely ruin his marriage. Probably cause problems for his job, too. However, you may not be concerned with the impact on his life but at least you should think about the impact on your life. If you disclose that issue at work you also may see negative repercussions at work. People may distance themselves from you. You may be perceived as a troublemaker or problem in the workplace to co-workers or management. Management could fire you to get rid of the uncomfortable situation you may create.