Remember their is only one judge, and that is God. Then ask yourself 'Have you done something to cause this person hurt shame or to be be discredited? '
Let's say that now you discover what you thought was right, was actually a lie, the person you thought was a true friend was actually lying, not only to you but to others as well.
It is hard for you to accept because a seed was planted within you, that is called a lie, and it grew. Now that person that was lied on, quit their good paying job because they could not take all the shame, being talked so bad about daily.
Do you feel somehow responsible? The dangers of Gossiping, without having all the facts, only going on the 'he said he said', can really cause others harm.