Well, if it's in a relationship and they're being unfaithful, breakup with them... obviously they don't think you're good enough for them, but they are so wrong. Or you can bring it up to them...
TIP: if you get into a fight about it (or anything) keep your voice as low as possible, don't raise it! Then, they'll eventually listen to you because you're not being loud or unreasonable.
nerolinguistics is the study of if someone is lying
Perjury is to lying as homicide is to killing someone.
Chronic lying is a sign of sociopathy.
If you are lying about seeing someone else when you shouldn't be the it's cheating. If you are lying so you don't hurt someone's feelings or you're lying to protect yourself from something you did wrong it is not cheating.
The chemical released during lying is catecholamines
get them help, counseling or certain classes
Fist to the face
Stop lying
protecting someone
No
You can detect if someone is lying is if they do not look into your eyes when they are talking to you about stuff. However if thelier is good at acting then all you could do is catch them in what ever they are lying about.
If you say someone is lying it is the same as calling them a liar. If you say they are mistaken then you are saying that they are misinformed.