I saw this on jx's blog and I thought he wrote it quite beautifully:

Sometimes, inevitably, i find myself looking back from this point in time into the past. When we shared a deep companionship that was meaningful and fulfilling; when our lives comprised each other and the rest of the universe was of relative unimportance. When all the stars in the sky were beautiful, shimmering jewels embedded against an inky black pattern wrought into infinity; when moonbeams shone down with a beautiful glow that illuminated and etched the warm, gentle, unsaid feelings that we held dear into our hearts. When we yearned earnestly for each other's presence during the time we spent apart, when being away brought on a sense of incompleteness tinged with longing.

At what point did that change? When did the fragile beauty mutate into a hydra of deceit, spewing more vile droplets of emotion every time one of its heads was cut off? When did the poisonous green canker infect and permeate every conversation, thought, and encounter, robbing it of satisfaction, fomenting endless strands of mutual contempt? When did the playful bickering turn into horrific arguments, the small mistakes into epic errors of unforgivable hubris?

In short:
When did we stop loving?
The End of a Journey?

Quite amazing how feelings can change so absolutely towards a person we once love. I guess it becomes inevitable that when feelings fade, intolerance and impatience towards the person also increases. In the past, it seemed that the person could do no wrong, but now all you see are the flaws magnified.