For no reason whatsover, I did a Google search for "Unrequited love." The first hit was "Unrequited Love: Agony and Rapture", which seems to originate from the Physics department of Ohio State University, which doesn't surprise me for some reason.

Where was I going with this?

Oh, yeah. One of the funny "tips" is during the page on Communication, where they suggest memorizing every personal detail possible, even while not trying to avoid obvious pitfalss: "As you sit with them listening to that smooth, calming voice, you are likely to become entranced by the movement of their sweet, beckoning lips, the subtle variations in the color of their hair, and the texture of the skin on their hands." So pay attention. That's the lesson.

It seems to be a guide for making unrequited love the absolute apotheosis of the concept. Again, no idea why I'd be looking that up in the first place.