Why would a girl ignore you after you said you had feelings for her?

I find it childish that after three months of me and this girl talking I expressed I wanted to take her for coffee and she never spoke to me again and ignored me in public. Why is is this? I feel disrespected. I would appreciate a something verbal instead of ignoring me. Maybe some woman here can explain this.

Why would a girl ignore you after you said you had feelings for her?
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