4. Attacks When Asked a Question
How many times have you asked your partner a question but instead of replying they attack you for even asking that? Clearly, it is very suspicious. A person who has nothing to hide has no reason to burst out in anger when asked a question about their whereabouts, especially if the question is completely innocent and not even remotely related to cheating. This is one on the list of ways to tell if someone is lying about cheating a liar uses to cover his guilt.