Nobody wants to admit it, but sometimes people lie to you so they don't hurt your feelings. You should know it happens: because you do it too. I do it, you do it, it's not great. But it happens.
There was an article recently published by The Wall Street Journal about our habits when we lie. And well, I figure if there's anything we could all use, it would be a clue or two to suss out when someone's fibbin'. Of course that might mean you'll have to be more careful if you decide to tell one.