What does it mean when a guy gives you a low five and kind of holds your hand for a second softly?

He gave me normal low and high fives before but lately his fingers started to linger a bit everytime, and it feels kinda intimate, don't know if it's just me though. I wonder if it's nothing or he likes me?
I've noticed that he's like that only with me.
What does it mean when a guy gives you a low five and kind of holds your hand for a second softly?
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