My guy friend doesn’t let me pay for ANYTHING, why?

He would stop at work during my breaks with Starbucks, bring me lunch during my lunch breaks and just now I insisted on paying and he had his money ready and the lady took it even though I had my card out.

Is it a guy thing? Like it doesn’t make any sense for someone who’s just a friend.. right?
My guy friend doesn’t let me pay for ANYTHING, why?
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