Above, it says that the world is divided into those who have experienced heartbreak and those who have not. For those of you lucky or unlucky to not have experienced heartbreak, I offer you an important warning: "heartbreak" is not a metaphor. "Heartbreak" is not your mind's way of trying to parse and interpret your feelings, or to explain them using poetry. Heartbreak, (and heartbreak can be caused by a number of things, ill-fortune at romantic love being just one of them) is an immediate feeling in the chest. The only thing inaccurate about the metaphor is that (at least for me), I never feel it as a sharp, tearing pain as "break" might suggest. Its more like a dull aching emptiness somewhat akin to getting kicked in the stomach. Only less fun.