Why do women say they have boyfriend when they don't?

gtex1991
they have been women who say they have a boyfriend whether you hitting them or not. for example a girl will reject you and say she has BF, or you are dancing and you want to dance with her she will say she has BF. in both case neither of them have one

what's the reason behind this, are you testing the guy?
Why do women say they have boyfriend when they don't?
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