I would agree with the “once a liar” issue, if the lie is meant to deceive someone materially. Even Hashem told a “white lie” for the sake of sholom bayis. So I think it depends on the type of lie, and its purpose. If you go out and suggest a certain type of restaurant and he hates the food, but takes you there, to please you, and says he liked it, is that really so bad? If he was arrested for DUI, but fails to disclose that, it is more problematic.
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