What does it mean when a guy high fives you and then holds it for a few seconds?

IndependentGal15
So I was getting out of my brothers car when one of his friends (that I like) gives me a high five and then holds my hand for a few seconds and squeezes it. We held hands for approximately 5 seconds. 5 seconds is a lot. Am I looking into it? Was it just a friendly gesture?
Friendly Gesture
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What does it mean when a guy high fives you and then holds it for a few seconds?
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