A quote that a friend showed me:

To love is to suffer. To avoid suffering, one must not love. But then, one suffers from not loving. Therefore, to love is to suffer; not to love is to suffer; to suffer is to suffer. To be happy is to love. To be happy, then, is to suffer, but suffering makes one unhappy. Therefore, to be happy, one must love or love to suffer or suffer from too much happiness. I hope you are getting this down.

There's so much truth in that...it's almost scary.