In defense of ghosting, a person could be disillusioned by a friend and feel too afraid/embarrassed to say goodbye. For example, my friend was battling psychosis and was addimant his friend was out to get him and couldn't bring himself to say why he no longer wanted to be friends. So he deactivated all of his social media and stopped talking to everyone without notice in an attempt to get away from what was causing him so much anxiety, you see