There is a very narrow subset of people in the universe who meet at quite an early age, fall in love, stay together and get married.
The lucky few. The handful fortunate.
Why seek out another when all the questions have been answered?
Why tread new territory when you are most secure and safest with your true north?
The contrary opinion would be the “limiting” nature of the relationship. But no, you learned to fly with that person. And the journey is made more beautiful because you flew together.