You don't.
Yes they do, but their game is to lie and make sure that you can not prove it, even if you can, winning gives them a feeling of power.
If you know for a fact they are lying, then simply tell them. I know you are lying about whatever and I want you to stop. They don't have to of course, but you at least have told them. Just make sure you know what you think you know.
If a person is hiding the truth, they are not being completely honest about something. If a person is lying, they are intentionally deceiving others by saying something they know is not true.
I like to apply logic. Is what that person saying logical given what other facts you know.
You need to face the person that is lying about dating you. Your true friends will know this is not true so after confronting this person just ignore them and they will eventually go away.
You don't make anyone feel mad or any other way. We all choose how we feel. If the person is lying and you are sure they are, call them on it. It does no one any good to let it continue. If they want to get mad about being caught lying, that is their problem, not yours.
Example sentence - I would like to know how to detect when a person is lying.
ANSWER: Absolutely, if a person is not cheating nor seeing another person, there's nothing to lie about. But cheating on your spouse and he or she doesn't know you are betraying your partner that will be lying because your keeping secret.
It depends on what relationship he has with this person. Is he good friends with him? then, if so, then im sure he isn't lying. If he doesnt even know this person, hes still probably not lying. like, why would you lie about that? isn't that a tad bit odd? just ask him some questions pertaining to that. ask him how he knows and how he found out. but, im sure that boy likes you.
when the person your in love with or like you start seeing trustworthy or when you know that person isn't lying
bob guanine, I'm not lying know its weird but its true