Should i keep talking to my friend?

I've known this girl for like 2 years now and when i first met her, her and her bf had just broke up because he cheated on her. I would spend hours cheering her up telling her she deserves better and how if i were her bf i would give her the world and stuff like that. After a while they got back together and like 3 months later he broke up with her because he said he didn't know what he wanted. So again there I was to cheer her up and I did. But for some reason i started developing feelings for her and wanted to tell her but i couldn't because there was never a good time to tell her. So i told a friend of mines to tell her because he always saw her. Then, when i asked him what she said he told me she just smiled and left. After that she started kinda of avoiding me but i umed its because she probably felt awkward so i was fine with it. Finally i told her myself that i liked her and she said she didn't and she just wanted to be friends. It hurt a little but i got over it and was fine with it but now she doest even look at me, talk to me, or even bother to tell me hi every now and then. What should i do? work things out with her? or just stop talking to her?