Why do I get easily fooled by people?

I don't understand when people lie to me and I think everything they said with a smile is a good thing just because they smiled. PLUS it's rare when I realize they lied to me and when that person says “oh you misunderstood me” I think “perhabs I guess I really misunderstood” and again believe them so just because I've never lying do I think everyone is like me or am I stupid I can't even understand this

Why do I get easily fooled by people?
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