Why do you look at a person differently when you know them vs when u don't

I believe it’s because you know more about what’s going on inside their heads or more about what they are saying if you know them, and there is a layer of comfort around someone you know, whereas with a new person there is the intrigue of learning about a new person and having them know more about you, but there is a bit of anxiety of not knowing them

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pop,R&B,soul music,maybe country

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these are just my opinion