Falling in love can be likened to falling off a high-rise. In both cases, if there is nothing below to catch you, you will end up with a shattered heart or a shattered body.
And yet, knowing that, we fall in love anyway - hoping, praying and trusting that the other person will be able to hold our hearts safely in their hands.
But when they don't, whether because they cannot or will not reciprocate your feelings, the very fragile heart shatters...and it is a rather nasty thing when you realise that your heart is shattering in front of you.
Then again, in the words of Bruce Lee - "Love is never lost. If not reciprocated, it will flow back and soften and purify the heart."