What is your reaction when you find out someone lied to you?

It seems lying to someone comes so easy to people anymore. People look you right in your eyes and lie and even try to sound so convincing so you will believe them.
I am from the old school on this on. If you lie to me once, shame on you. If you lie to me twice, shame on me. It breaks any trust I had for the person.
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It can be any kind of lie that had a bad effect on you. Not a white lie, but one that is substantial.
What is your reaction when you find out someone lied to you?
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