If a good friend of yours warned you about a person and later it turns out they were completely lying about it would that make you question them?

So lets say you just meet a person and you like them. but a close friend of yours also happens to know them and tells you they are not trustworthy do to certain details he tells you. Then later on after getting to know the new person more you find out the close friend who warned you completely lied about it.

What would you do?

If a good friend of yours warned you about a person and later it turns out they were completely lying about it would that make you question them?
If a good friend of yours warned you about a person and later it turns out they were completely lying about it would that make you question them?
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