Why won't he let me pay?

So last month I ate out with a guy I like and he paid the first time, even though I had money. Yesterday I ate lunch with him again and his friend. His friend ordered first and paid for his food. I was next in line and the guy I like stepped up to the counter with me before telling me to tell the lady what I wanted.

Then he ordered his food as I was taking out my money to pay. When I handed him my money, I told him I got it. He refused my money and batted my hand away. Okay, so this is for guys, do you do this with your friends that are girls?
Why won't he let me pay?
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