I always like the old tale that says... When a soul is breathed into existence from the stars, it is then split in half. The two halves are then cast upon the winds of fate. Some may land within reach of each other, some at opposite ends of the earth. Both halves earning for what is missing, will always search for what is not there.
I kind of always liked the idea that we each have another half out there. Perhaps that is why we are always searching for something.
How often do we hear about people who seem to be the picture perfect couple. Then BLAM! Then all you hear about is the break up, and who they are with now. Was it because they hadn't truly found their other half, and have they now, or will they still search.
That may explain the couple that could not be more different. Perhaps they have found their other half.