There's nothing I can say about love that isn't tucked somewhere in here, and way more eloquently than I could put it. Socrates' "ladder of love" theory is particularly beautiful, although it deviates a fair amount away from what we generally think of as traditional love. Worth diving into if you have some time.

EDIT: that's kind of a cop-out answer though, and doesn't add much to the discussion at hand. I will say that we use "love" as a catch-all term to easily describe any number of complex relationships and emotions. It's like that Radiolab on color, where they talk about how before there was a name for the color "blue," it's conjectured that people almost didn't even perceive the color blue as blue. They always found an awkward work-around, like "grey" or "wine-dark" or "purple." So there's this very real thing that, because we don't have the right receptors for or because we haven't found the language to shape our perception, we don't end up seeing as it truly is, or else mislabel it as something else. Come to think of it, this probably happens all the damn time with a million tiny aspects of our lives given our pitifully narrow spectrum of perception and our laughably restrictive language structures. And it might be that a higher life form would have no problem pointing out a quality and describing it simply and perfectly, but we're just unequipped. It's like asking an ant to accurately describe in human language and on human terms the idea of pheromones, and how they shape the ant's life. We can work and work our entire lives or as a race over the span of several hundred or thousand generations to define a thing, but maybe we're just not equipped to identify and describe the thing as it truly stands. Doesn't mean we shouldn't try, though.

There you go, that's love.