Why did he fist bump me? Does he like me?

FitMaven
I'm a manager at a gym and he's a regular member. He teases me ALL the time, calls out my name alot, talks to me for a long time in between his workouts and brags and shows me pics of his trip, makes fun of me, I catch him staring at me sometimes, he shows off in front of me and told me that "You'll learn I'm different from the guys here, I'm not some guy with muscles (then he flexes) and no brains. I come in talking about Archimedes and theoretical physics" When he's with his friend they both smile at each other and smirk when im around.

Yesterday he flirted a lot and for the first time we actually touched he walked towards me with a smile on one of his breaks and fist pumped me, but hasn't done that to any of the front desk girls just me.
Why did he fist bump me? Does he like me?
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