I am searching for a short story that I read in the mid sixties but I am pretty certain that it was many years old by that time. The premise of the story was that the human race had developed the ability to communicate telepathetically. However, this meant that negative thoughts about people were communicated to them when in previous eras they would never have been spoken aloud. As a consequence, suicide became commonplace and the only survivor of the human race was a man who had gone to live in a cave. He survived because nobody knew of his existence and therefore nobody had negative thoughts about him. I'm afraid that I cannot offer any more practical information such as publisher etc. This is something that I have dredged up from my memory from about 50 years ago and feels pertinent to our current age of social media, trolls etc. Thank you for your help.