The single most distinguishing characteristic between happy couples and distressed couples is that happy couples are more likely to be best friends and actually treat each other as best friends would.

These married friends truly enjoy each other’s company. They routinely create opportunities to be together doing activities they both enjoy and alternating between each other’s favorite activities. They know each other’s simple preferences, like how they like their coffee, their back scratched, and their steaks prepared. They know each other’s pet peeves and either share them or find them amusing.

Because they are friends, happy couples share and express mutual respect. They know each other’s intimate secrets, disappointments, hopes, dreams, and deeply held values. They have a deep and strong positive regard for each other and naturally demonstrate their care and support of one another in dozens of ways — big and small — every day.

Married friends also have both typical, solvable conflicts and the more distressing on-going conflicts that can be very troubling for some couples. The difference between happy couples and those heading for divorce is not the absence of solvable conflict, on-going conflict, or even gridlock.

What allows married couples to remain happy through the inevitable ups and downs of marriage is that they treat each other as they would their best friend. They respectfully and directly address their solvable issues, seek to understand one another, and are willing to cooperate in having the difficult conversations needed to identify the hidden issues disguised by their conflicts. But, to be in this marital zone, you and your spouse truly have to be friends.

So, the next time you complain to your spouse for the 10th time about the same thing, remember the most important F-word in marriage and ask yourself this very important question: Is this the way I should talk to my best friend? If not, focus on the friendship, not the incident, calm down, and “Work it Out.”

Then, start making your spouse your new best friend.