It's really sad when someone lies to someone else and you know. You try to tell the person, but they believe the liar instead of you. This is double the pain.
This is sooo true...recently placed in this exact sittuation.
Basically I could either believe my "friend" (who turned out to be the liar) or my sister (who my friend tried to make look like the liar). It definately left an impression.
This has been making me so sad lately.