Personally, I do! I say tell the truth and let the person decide how they feel about it, sometimes the reaction might not even be as bad as your thinking. It's better for them to know the truth than wonder if your lying, that could effect things majorly. Depending on the relationship with the person and what your lying about you could possibly really hurt your relationship by not being completely honest. If you know it's something you might have to lie about, think twice before doing it and make sure whatever it is, is worth it, if not don't do it. If it's something that has already happened, just tell the truth and see what happens, if it's bad then that's what's meant. And always remember that "everything happens for a reason."