Usually people lie because they are afraid of the consequences of the truth. The only way to get someone to stop lying to you, is to change the reactions that one might have after hearing the truth. Therefore causing the person doing the lying not to feel compelled to lie in order to protect themselves from the potentially harmful negative emotional reaction of the other person.
There is a quote that I find fitting about this subject:
"The [person], whose behavior indicates, that [they] will make a scene if [they are] told the truth, asks to be deceived."
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