Ask a girl out and she says yes, but later she changes her mind?

Anonymous
Hi,

This girl has been flirting with me for a while now, so I start talking to her and after talking to her a couple of times I ask her out and get her phone number (she says yes). Then 2 days later when I arrange for us to go out she says she doesn't think it is a good idea, really confused. This has happened with a few other girls as well so I don't understand. It is not to do with my looks as I'm told I am very good looking and she doesn't really no me so I doubt it is my personality either. She is 3 years younger than me if that helps. Should I call her and ask her why she doesn't think it is a good idea? Any help would be appreciated, thanks bob
Ask a girl out and she says yes, but later she changes her mind?
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