bitter mental departure

I used to have this friend. He was a good guy, young and a bit ignorant of the world and its politics, relatively harmless. Then one day he moved away and I lost my friendship with him. We tried to keep it up via modern technology. But there was this unspoken forfeiture of attempts to stay in contact. And as always, the world moved on. I still hear from him every now and then, but there isn't anything there really. Empty.
I used to have this friend.
But I don't know him anymore.