If a guy pats a girl on the upper back while saying thank you for something what does it mean?

Anonymous
sorry I'm not used to be being touched by guys so when I do I have to think about it and wonder if it signifies something, by the way I do have a crush on him and he does flirt with me sometimes but I can't tell if its friendly flirting or real...
If a guy pats a girl on the upper back while saying thank you for something what does it mean?
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