Why would I girl I know do the impossible to hide that she has a boyfriend and only from me?

Why would a girl I know and she's very close to me hide from me that she has a boyfriend. And tell me that no one touched her. by the way this girl flirts with me, text me first every day, she's always mad when I ignore her, she gets mad when I mention other girls... in addition to all psychological and body language signs of attraction.
Why would I girl I know do the impossible to hide that she has a boyfriend and only from me?
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