Why can't be friends anymore?

i met this girl a year ago we became friends then we became really close friends talking 24 hours flirting all the time telling each other everything then we started to tell each other i love everyday but as friends then i really started to love her so i told her she didn't have the same feelings but thats not the problem she refuse to talk to me anymore and she seems like she doesn't care she just stopped talking to me and i really miss her a told her that to gain our friendship again but she said no we are just colleagues and its not a big deal and that really hurt me so why? what happened?
Why can't be friends anymore?
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