I told my friend i loved them, and they rejected me, HELP pls!?

im 15 and i have a mate called catherine who last year i told her i loved her cos we got on really well and there were loads of signs such as we looked into each others eyes all the time and when we played badminton at a friends party she wouldnt let anyone else but me join in and she always ate all my food at school. I still don't know what all these signs meant But anyway i told her i loved her and she sorta didnt say much, she said she wasnt interested but then she started to hate me, and we havent spoken since, she won't talk to me or reply to any of the txts or letters i send to her, I Know she doesnt wana go out with me and i just wana be mates again, its just she says she hates me and i don't no why she does. And why won't she be friends again, all these things must have meant something to her. HELP!