Why would a girl always say she's too busy to go out but then get jealous when you go to other women?

Just wondering what goes through a girl's mind when she does. I asked her out she said she's busy so I assumed not interested but we are still friends so I went with another girl. She's the first one to open my snapchat and then gets angry at me for even brining the other girl up she called her a whore pretty much.
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