How Do I Cope with Someone Being a Pathological Liar?
https://www.healthline.com/health/pathological-liar
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Their lies seem to have no clear benefit
While a person might lie to avoid an uncomfortable situation, such as embarrassment or getting in trouble, a pathological liar tells lies or stories that don’t have an objective benefit. Friends and family can find this especially frustrating because the person lying doesn’t stand to gain anything from their lies.

The stories they tell are usually dramatic, complicated, and detailed
Pathological liars are great storytellers. Their lies tend to be very detailed and colorful. Even though obviously over-the-top, the pathological liar may be very convincing.

They usually portray themselves as the hero or victim
Along with being made the hero or victim in their stories, pathological liars tend to tell lies that seem to be geared at gaining admiration, sympathy, or acceptance by others.

They sometimes seem to believe the lies they tell
A pathological liar tells lies and stories that fall somewhere between conscious lying and delusion. They sometimes believe their own lies. It’s difficult to know how to deal with a pathological liar who may not always be conscious of their lying. Some do it so often that experts believe they may not know the difference between fact and fiction after some time.
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When asked questions, they may speak a lot without ever being specific or answering the question.
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