All I can say is: duh!

Divorce doesn’t harm the family only when children are young. Marriage is a bond that forms a foundation for family networks. This nonsense about “unfulfilling marriage” is simply our hyperindividualism on shameless display. That’s not the job of your marriage, to offer you some kind of fantasy “fulfillment”. Your dissatisfaction is likely rooted in your self-centeredness. We know that selfish, self-centered, self-obsessed people are the most unhappy people. Well, here’s a thought: stop prioritizing your “happiness” and your “fulfillment” and be an adult. Recognize that your marriage is for the good of others. A large part of being an adult is to enable the common good of your family and your society. Your family depends on you. Your society depends on you. Divorce motivated by abuse is one thing, but “lack of fulfillment” is a sign of perpetual adolescence.

Want to be happy? Happiness is found in virtue. Learn to live for others and stop being a parasite who burdens his spouse with the impossible task of making you “happy”.

Different people can have different goals / purposes for the same institution.

Marriage is one example.

Another that comes to mind is going to college. Some see it as a chance to discover themselves, others see it as essentially a training program for specific careers.

From your profile, I'm guessing you approach this from a Judeo-Christian perspective? If you believe the institution of marriage is defined and ordained by God, then your normative view of it makes sense. Just be aware that not everyone in this discussion will share those assumptions.

My wife is from a time and place were divorce was almost unheard of. At first she was appalled at what she saw as bed-hopping here. But over time she came to realize that it really came down to stay in an unhappy situation or split and try to find someone you're happy with. Of the relationships of her cohort she is close enough to know the situation most are dead, no love, no sex. Nothing but saving face.

> stop being a parasite who burdens his spouse with the impossible task of making you “happy”.

I think that divorce actually solve this part in a very direct and straightforward way. After divorce, your partner does not have the obligation to make you happy. You are not burdening them and you are truly responsible for yourself and your hapiness.

Marriage is about love and only love. What love means is personal and varies person to person of course. And it isn't a given two people remain in love for eternity - that's what makes marriages that stick for the right reasons so beautiful.