If a guy shuts down flirting by mentioning his girlfriend does it mean he does not find the girl he is talking to attractive?

I didn't even flirt with him but maybe he took me being more talkative than usual as flirting. He remained polite but was not as smiley and chatty as usual even though I caught him checking me out several times before and he used to be very interested in my personal life the first time we talked.

Yes he is probably not attracted
No not necessarily
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If a guy shuts down flirting by mentioning his girlfriend does it mean he does not find the girl he is talking to attractive?
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