Strange question, but what does it mean when a guy pats a girl on the back?

Anonymous
so this guy in my class and I have been friendly flirting, he's called me cute and pretty and we look at each other a lot, but the other day he came into class sat next to me and said hey hows it going and then pat me on the back while sitting down...and I don't know I've never experienced that and felt like he's not into me or something, because guys usually do that to other dudes, so am like one of the dudes or am I a potential for him?
Strange question, but what does it mean when a guy pats a girl on the back?
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