A relationship can keep functioning long after the relationship itself has stopped developing.
Bills get paid. Children get collected. Meals appear. Family events are attended. Holidays are booked. You sleep in the same home. To the outside world, nothing obvious is wrong.
Inside, both people may be maintaining an arrangement.
That does not always mean the relationship is finished. It does mean function has started replacing connection.
An arrangement is efficient
Arrangements are built around tasks.
Who pays what?
Who cooks?
Who drives?
Who handles school?