One of the most remarkable aspects of human nature is the complete and absolute difference between one person and the next.
I am especially amazed by how one person is able to move on from something so much easier than another one. Being fixed into a position and feeling powerless to move seems to affect every other person on earth, meaning the other fifty percent "unfix" themselves and walk forward eventually, or often immediately.
Maybe it is God and nature's way of maintaining a sort of balance on the earth. When there is loss, one continually grieves as the other moves on...possibly being the idea that even though life goes on, a part of that person remains alive. Love. Another example. One will continue to love somebody even when said person eased forward, far ahead of that person...so that way, something never meant to be makes a much better fairy tale.
All of this, really, is probably total garbage, but at least somebody has thought about such rubbish and had the decency to write about it.
*Strongly recommended film: The Beaver - a little gem no one saw because it had that evil Mel Gibson. Listen, get the hell over yourselves and realize the world is fortunate it will never see certain aspects of you we may find as equally or far more repulsive.*