I dont know what to do?

Had a argument with my female friend about 3 weeks ago i called her out on some things she had started to distance herself from me and wasn't being there for me when i needed her support she never apologized and now she is avoiding me the thing is my friend says she's always talking about me and i catch her staring at me at work all the time why won't she even try to talk to me we were very close and i have no closure and kind of heartbroken i don't know what to do anyone have any advice?
I dont know what to do?
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