Yes Jerry, everyone has lied, and been lied too - parents talk of Santa and the Easter Bunny, etc.. The difference is whether the lie was told knowingly, or the situation has changed and the truth was negated - when you break terms down to simple rules like "lie or truth", since it is an either or and no gray scales in between, lies happen all the time.
If lying is meant to spare someone's hurt feelings, we justify it - but it is still a lie. If we lie with the intent to not do it, it is a lie, if we accidentally say our age is 50 but it is 51, as innocent as it is - it is a lie. Lies are untruths. We use words like "white lies" "errors" "half truths" and so on to justify our not being truthful - but in the end, if it isn't true, it has to be a lie. Justifying lies is almost a 1 to 10 scale process, we feel better if what we say makes it easier for the other party to swallow, but in fact we had to make a lie up, and since it was done in a way to reduce the "degree" of the lie, it still is maliciously done.
"A promise is a lie if you cannot with complete certainty dedicate yourself to fruition, and all unseen events can change the truth to a lie" ( The counted book of chosen sorrows - Dean Koontz) which is really true - all the hoping in the world has a double edge sword about it, you can't guarantee anything, cars break down, emergencies happen and simply put if something is NOT the truth, than it is a lie. Intent to complete a truth does not change that it is a lie just because circumstances don't allow the truth to occur.
So how can anyone innocently or purposely tell the truth and not open a door to a lie? Okay, lie may be a "big word", over-stating a commitment that is broken for unknown or known circumstances circumstances - but the defining line is if you mean to not tell the truth, we know that everything said could be taken as truth or suspiciously interpreted by the other party - it is when we know what we say isn't the truth that lies are embedded in stone - when STUFF happens beyond your control and the rules change, then in the real world you are forgiven, Chit happens and if the lie was purposefully done - only the gifted gets away with untruths, yet they lie. A dictionary says: LIES, an untruth! It doesn't excuse unforeseen events though, so it cannot account for them.
When unforeseen evens occur, we forgive the person, but the promise is broken, the task is incomplete so Webster would call it a lie.
About being lied to... Yes I have been many times, when it is obvious, than it is rarely forgiven, when it is unforeseen events I forgive UNLESS the party was given a better offer that they opted, that I think is one of the worse kind of lies.
Tell me the truth, "I got a chance to meet someone famous or do something spectacular after we made plans - I really am sorry but this is a once in a life time chance - I promise to make it up to you!" is much better than saying, sorry I feel like crap, can we do it some other night okay?
And finally: I would rather be told "It is none of your business" any day than lied to. Lots of things are none of anyone's business - being honest and temporarily hurting feelings is always better (to me) than being lied to.
Lying is also a survival instinct I believe, giving a lie can get you out of a predicament so it is used. So if it is a defense mechanism, then we can hardly blame some lies on that imaginary 1-10 scale.
Just so thinking aloud, I personally don't believe all lies are equal but look at sin (which lies are according to the Bible) and all sins (as unimaginable as it may seems) according to the Bible equal - theologically speaking it's hard to go through life without lying at least a few times a day. Will you see the list of lies on Judgment Day, it would be interesting!