Is it unfair that if a girl is not interested in me right when she first meets me I do not want her later?

I get the impression from most girls I’ve talked to that they think that my interest in dating them will not go away with time. Do u think I am being too harsh? Cuz like tbh if a girl fucks another guy after I’ve already started talking to her I just feel absolutely disgusted and can’t take her seriously. What do u think of this?

Is it unfair that if a girl is not interested in me right when she first meets me I do not want her later?
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