Under what circumstances, if any, would you lie?

Going against the tenet of Right Speech, I would have no problem lying if it involves seriously sparing someone's feelings.  I can think of a specific instance in my life when I feel like it was actually better for me to lie than to tell the truth.  A friend was going through a very hard time in her life, and I understood why.  Things were falling apart around her and she was not handling it well.  She asked me if I had heard other people talking about her and her situation.  I had, but this particular friend would have become obsessed with that information.  I told her that I did not know what people were saying and that it shouldn't matter anyways.  A lie, yes, because I did know.  But I think it was better for her mental health not to have me confirm what she was already fearing.