Usually, people trust their friends enough to expect not to be betrayed. They especially don’t expect to be betrayed in the way that friend knows will hurt them the most.
Today’s author was so trustful once, too. She vouched for her friend to get a job at the prestigious hotel where she worked, and she succeeded. But soon, the friend started having a relationship with a married coworker who had a baby at home. And she did so despite knowing how hurt her friend was when her father’s infidelity ruined her family when she was a child.
More info: Reddit