I am making this posting to learn the rational ways to respond to betrayal. I define betrayal as intentional actions attempted to harm someone (say "X") by those persons whom X helped a lot in the past.
Paul Hauck has written in "Overcoming the Rating Game" (page 67 to 94) that "If people do something bad to you intentionally, then do something equally annoying or discomforting to them". He says that we get the behavior we accept.
Carl Sagan refers to Robert Axelrod's related work involving continuing round-robin computer tournament (Chaper: "The rules of the game" in his book "Billions and Billions"). He concludes that the most effective strategy is "Tit-for-Tat". Tit-for-Tat is defined as "you start co-operating, and subsequently you simply do what the other person did last time".
If direct speaking doesn't work and if it is clear (even to outside observer) that the actions are intentional, is it better to use indirect actions to employ the strategy of Tit-for-Tat?