She paid for our meal on the first date... How would you react to this?

I'm a guy and I've been with this girl for a month and before we got into a relationship, we have been friends for a year. She keeps on paying for our meals even though I insist on paying for it, she refuses and pays it herself. Is this much of a big deal that I should worry? I don't mind paying for us two but I just feel that the duty to pay must be on me. Would I have my man card revoked for letting my girlfriend pay for our meal? Is this some part of 'boyfriend tests' done by girls to see what-would-happen-if? Help

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