There are several reasons why a married man might decide to end a relationship with someone other than his spouse. Some of these reasons include Guilt and remorse over betraying his spouse. Fear of the affair being exposed and realizing that the extramarital relationship is not as fulfilling as initially thought. Pressure from the mistress to leave his spouse, which the married man might not be ready to do. A desire to work on the existing marriage and attempt to rekindle lost intimacy. It's important to understand that each situation is unique, and the reasons for ending the relationship can vary significantly between individuals.