If you got married without knowing you loved each other then you’re stupid. If you’re the type of person who can fall out of love with a person without them doing anything or any outside event happening then marriage as a concept just isn’t for you. If you get divorced simply because “you don’t love each other anymore” then you either rushed into the marriage without thinking it through, marriage in general isn’t for you, or you’re giving up.
Those are some pretty naive generalizations, honestly. And I don’t even disagree for many cases. But still, you’re generalizing. People are more complicated than that. Our societal conceptions of how “love” work are largely bullshit.