Only if it would serve a diplomatic purpose (towards other people than us two), and the lie would be rectified in a private setting, within 24 hours.
Examples of "love lies" are: "I think you look stunning today", "I would never love anybody else but you" and/or "I've been thinking about you all day".
Remember that i am asking for opinions! This question does not intend to answer "What is the better way to judge love lies?" or "What is the most appropriate reaction to being lied to?", but rather "How do YOU feel when this happens?". That being said, if the discussion that might/might not stem from this question changes your mind or improves your actual feelings regarding the situation, i'd be more than pleased.
The question is pretty vague and some context would make answering easier.
If someone I know or I care about lied to me, then I wouldn't be happy at all. But if it isn't made out of bad intentions I wouldn't be mad about it. However, I would be frustrated because depending of the circumstances it might prove a lack of faith and the more this someone is close to me the more it hurts.
Yet I would care less if the one lied to has no relation whatsoever with me, as I wouldn't know about it and it wouldn't impact my lifestyle. Moreover, one can't squeeze out every secret of the world as it is a really tiresome task. So sometimes it is better to let go. In that case, no happiness nor sadness.
And last but not least, there may be a case that makes me happy. It is really simple but not to forget and for that I give one example : surprise parties. Yes, it is sometimes more a bother than anything else, but these moments are memories to cherish and makes you happy when you think back about it.
Eventually, I do not argue that my opinion is not flawed, so don't hesitate to share your own.