Dating

What would possibly make you not want to know better someone who satisfies your basic requirements and has asked you out?

Suppose someone proposes you for dating and to get familiar. Do you have special qualities in mind which you can easily say no if they don't have?
If that person has these primary requirements, what would possibly make you not want to know him more?
Have you had these kinds of experience?
What would possibly make you not want to know better someone who satisfies your basic requirements and has asked you out?
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