All losses are sad. The end of an important relationship is also a death. When people fall out of love with each other, or when what seemed like a solid friendship falls into ruin, the hope for a shared future--a hope that provided a context and a purpose to life--is gone. [p. 149]
Happiness Is an Inside Job: Practicing for a Joyful Life (ed. Ballantine Books, 2008) - ISBN: 9780345513014