In order to confront a spouse about lying, compassionately address the problem through a calm and understanding conversation. They should also avoid being confrontational, as the person being accused may argue instead of attempt to have a conversation.
Approaching a spouse who continually lies can be difficult, as the liar usually will not want to be approached. Offering a compassionate conversation allows one to inject what they want to say without raising the lying spouse's anger.
Focus on their personal feelings of the situation. This creates a comfortable environment, where the lying spouse will be willing to converse. Take the lead and slide in concerns for the issue at hand, while explaining what lying does to the relationship. These types of discussions make room for the dishonest spouse to be held accountable for the things they say.