Orpheus loses Penelope when, as he makes his way back from the world of the dead, he looks back to see if she's actually following him. Likewise, in the Clive Barker story "Hell's Event," the humans competing in the foot race against Hell's runner are lost, one by one, when they look back over their shoulders toward the apparition at their heels.
An older woman I respect for being at peace with herself and the world once said to me, "You have to turn the page--move on." It seems like good advice, but I find it difficult to accept.
If we don't look back, then we forget. If we forget, then we betray the dead, even as we die ourselves.
(image from www.duniho.com)