Why doesn't he flirt with me anymore?

My guy friend is a naturally flirty guy. He says he is not looking for a relationship. When we became friends, he used to flirt a lot with me but it has died down, except once in a while when he gets drunk. Moreover, he flirts with many other girls, and no he's not interested in them, as some of those pretty girls did ask him out but he rejected them. I think flirting is his way of being friends with girls, so I wonder why he doesn't flirt with ME anymore. Am I not a friend anymore?
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Why doesn't he flirt with me anymore?
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