My ex-best friend deleted me from facebook?

I go to my Facebook and see that my ex best friend has deleted me? She even keep her exs and people she barley know so I don't get it? I distanced myself from her because she was acting different, lying and selfish. One day she stops talking to me so I stopped talking to her. We grew apart but she kept glaring at me whenever I see her and stepped away if we got too close. Not so long ago I figured to send her a message saying we could talk, she gave me her number and was so friendly and promised to call me later but never did. Now she has deleted me? I feel sort hurt because we were best friends for three years and I tried talking to her but she turned me down? We have mutual friends and almost everyone of them has taken her side. I feel so alone.
My ex-best friend deleted me from facebook?
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