As your kids age, your friendship circle morphs to school families or the other sports team or drama club parents. And when that period ends and your kids leave the nest, you are left with... well, frequently not much.
We both know is that in every long-term relationship, once in awhile you need to let off steam. We save up the small injustices along the way and four times a year unleash them. The stated reason for the quarrel has nothing to do with what's really going on.
You know who your friends are. They are the support group that will see you through the changes that lie ahead; they will accept your eccentricities and show up when you need them. What you may not realize is that they can also contribute to a longer life.