Is there need flogging a dead horse? Or shall dry bones rise again to be a mighty army?
So many couples live in self-denial to a marriage that is no more than 'polite enemies' co-habitation.

Usually a comatose marriage is known by its body language, not for their express admission/confession.
By the time a party cries out for divorce or third party rescue, its painfully late.

Don't give up on your marriage too early but also discern when you are holding on to air.
Understand obvious signs of a crashing marriage and do what you have to do. Be guided.