Help why does she hate me?

there is this gurl i lyk nd she is 15 nd i am 16. well i met her in september last year nd she nd i taked about relationships nd stuf nd we enjoyed our time 2gether then she had 2 go. 2 weeks later i relised i lyked her nd asked her out nd she regeted me. a week later i got over her nd asked her if we could remain friends but she refused nd when i asked y she got angry nd told me neva 2 contact her again. a day later i heard thru a friend that she hates me nd no1 knows y. any ideas what 2 do or y u thnk she mad at me. (she has also cut all ties nd connections with me bar her nd my m8)