In Elizabeth Day’s new book about the fragility of friendships, annoyingly but memorably entitled Friendaholic, there’s a gripping chapter on ‘ghosting’, the process of turning a friend into an ex-friend without explaining why. It culminates in the act of cutting them dead in public. I’ve always found it a haunting experience when someone does it to me, and I hope my ex-friends feel the same way when I do it to them.