How do you deal with people you found out are liars?

Well, for me it depends on the lie and the number of times they lied.
Like if they lied to make someone happy or a small lie that doesn't hurt anyone I am ok with it.
But, if they lie continuously or they lie for no reason just for the sake of it and you have caught their lies a few times then I just ignore them no point in confronting them and ruining my mood because they might lie again.
How about you, how do you deal with them?

How do you deal with people you found out are liars?
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