Trust their actions,
not their words.
If a person says they'll do something
& their actions do not match what they say,
That is a lie.
If they do that,over & over again
& they actively work against what they said:
That is a pattern of lies,or:
Manipulation.
Furthermore:
If that person is confronted about a lie,
& say anything along the lines of:
"I never said that",
that is Gaslighting.
Trust their actions,
not their words.
This rule works for all people in power:
Politicians,businessmen,salesmen,conmen
&
pathological liars of any kind