Why do guys always insist on paying?

Why do men always insist on paying for everything when going on dates? I get they are trying to be polite, but sometimes the woman offers to pay and wants to pay. I know I should be "grateful" and see it as a polite gesture compared to a guy wanting me to pay for everything, but it does kinda bug me that guys do that. Especially for me cause I'm very independent and he already pays for all the gas (as I don't drive), and he drives 40 minutes just to come over (and then 40 minutes back). I feel bad him paying for everything: food, movie tickets, snacks at theater, gas money, etc. and I contribute nothing. Makes me feel insufficient.

Why do guys always insist on paying?
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