Girls, if a guy asked you if you were available to go out, why leave him on read instead of saying you were busy?

I asked a friend if she was interested in coming to my friend’s bar, but she left me on read. I saw that she was out with a mutual friend at a classier bar, while I went to a dive bar. We both watched each other’s stories on social media
Girls, if a guy asked you if you were available to go out, why leave him on read instead of saying you were busy?
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