You Talk A Good Game

If theres one goal thats impossible to reach in this world, its being a good friend.
However much you debate it, theres no way you can be a good friend.
Imagine you have a friend who is saying bad things about another friend but asks you not to tell them...
What do you do?
Do you be a good friend to the bitching one and not tell the other friend, but while doing that you're also being a bad friend to the one being bitched about....
Or you could tell the other friend that the friend has bitched about them, but then you're also being a bad friend there too....
So basically.. you're screwed.
How do you talk yourself out of this situation?
You could defend the friend being bitched about...but lets face it, how many of us would actualy do that?
And you're still being a bad friend there...
Seems impossible doesn't it?