AIn a five minute audio excerpt from the book LyingLying by Sam Harris he argues lying is bad. If I have done something bad, and I don't want my friend to know it, isn't is equally bad to lie about it as hiding it or saying "I prefer not to answer".
For example: if a woman has been sleeping with another man than her husband, and they have promised each other not to do so, surely. Surely the husband would want to know (arguably even have the right to know) but if not asked about it she hides the truth.
The question arises: is this hiding equally immoral to answering "no" if the man were todid ask the question? What are some common theories about this?