When a person who's very close to you - maybe the one person you really trusted - deals a painful blow, you can end up feeling deeply betrayed.
We asked five readers who have experienced that awful moment of betrayal, when you feel abandoned and totally alone in the world, to share their stories with us. We also asked a top psychiatrist to reveal what's behind their stories and what he thinks about betrayal.
Have you been betrayed? Share your experiences by taking part in our survey.
Also: do you look after yourself enough and are you too nice to others?