"This is a complex ethical dilemma, and the decision ultimately depends on the individuals personal values and beliefs. Some may argue that it is important to inform the partner in order to prevent them from being deceived and to uphold the principle of honesty. Others may argue that it is not the informants place to interfere in the relationship and that it may cause unnecessary harm and conflict. Ultimately, the decision should be made after careful consideration of the potential consequences and the values involved."
If you discovered that your friend is cheating on their partner, would you tell the partner? Why or why not?