They argue without weaponizing the past

The conversation that starts about tonight's plans and ends up in a catalog of grievances from the past three years is one of the most recognizable patterns in deteriorating relationships. Once the argument starts pulling in archived incidents — the thing that happened last February, the comment from the holiday two years ago — the present problem has been buried under the weight of everything that came before it, and nothing gets resolved. Couples who go the distance fight one fight at a time. They develop a discipline — sometimes an explicit one — for keeping the current issue in the room without the entire history arriving to help argue it. Old grievances have two possible fates: they were resolved, and should stay where they were resolved; or they weren't resolved, in which case they need their own conversation at a different time, not an uninvited appearance in a different argument. The past is powerful in a fight. Using it as a weapon is one of the most reliable ways to win the argument and lose the relationship.