A lost friend.

Is like a coin that has fallen from your purse, rolled across the ground, and into a drain.

You'll probably never see it again. But of course, you'll collect many other coins along the way, some old and rusted, some shinier than you've ever seen, but it'll never be the same. And as you watch that valued coin roll across the ground, maybe chase after it, you know its gonna roll into that drain faster than you can catch it anyway.

And you'll just watch it disappear, for most likely ever.