[He's just sitting there, listening to silence...oh wait did she hang up? Did he say something wrong? Where di-- oh there she is!]

Okay, since I don't know what he said I can only take my best guess. And I'm guessing it was something insensitive and obviously pretty hurtful. But I really don't think that one conversation should be enough to end a friendship that's lasted...what? How many years, now?