I believe that there are too many people in the world for there to be one specific person (as a soulmate). Other agree too, like @Allischaaff. But that sort of takes the wistful romance out of love, doesn't it? Sort of?
Then I found this incredible sepia-toned wedding picture of an elderly couple. This is love, I thought to myself. They set aside all others and clung to each other. In all of life's ups and downs, they stayed with each other through it all.
While I don't have insight into their lives as a married couple, you get the sense that they couldn't help but be together. I find that so magical and comforting.
I wish all marriages held on through the end of time.