It is like a cosmic train. Whether it goes in a direction or around a cosmic loop, we get on and get off, and meet people along the way.
In the grand cosmic train that is life, we come on board and meet our parents. We might have siblings already on it or at the next stations they get on. Along the ride, we meet others, family at first then friends. We play, have fun, learn. More people get on and we notice some people get off but don't understand why. You see, we're not told we will have to get off the train at a station. We tend to think life is the train, not the journey and everything around it.
At some point, if we're so lucky we meet our life companions. Sometimes we have more than one. And some friends stay through most of the journey.
One of the toughest parts of the ride is we see our parents getting off the train at some station. We weren't always expecting it.
At the end of the ride, we feel something is going on and that our station is getting nearer. Sometimes our lifelong partners go first, sometimes we're the ones leaving before. In either case, it's sad because we forgot we were temporarily on a cosmic train riding along a cosmic ride.
I'm not sure what the moral of the story is or if there needs to be one. Sometimes stories are as simple as how they are told.