Do guys know when a girl is flirting with them?

Dutchgirl97
My boyfriend is a very attractive guy. Sometimes when we go out to a get together, girls flirt with him. I get irritated that he doesn't remove himself or do anything about it.

I tell him that I didn't appreciate when that girl was flirting and he didn't do anything about it and he always tells me he "didnt know". He claims that he doesn't recognize when a girl is flirting (even though its obvious).

Do some guys really not know? Or is it just a way to avoid an argument because he likes the attention?
Do guys know when a girl is flirting with them?
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