I think many people can relate to that excruciating pain of love gone wrong. I'd rather have a broken arm than a broken heart.
Largely this is a class thing - writers tend to be cosseted little middle-class kiddies who think that the world owes them a royalty cheque. But just doing it - being in your room for years on end, locked in your head, alone with invented ghosts - it weakens and softens the body. And I know I can't just live in my head.