Girl liked me, I liked her, and I never asked her out?

i never seen her again for months I then met her and she ignored me in the club when I said hi and went off with her friends who came over chatting to me , I'm stupid for not asking her out but why would she do this , and should I just try and forget about her, we were good friends too before and I only realized my feelings after she was gone but it hurt when she ignored me ?
Girl liked me, I liked her, and I never asked her out?
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