She does not say hello anymore?

There is this woman at work we used to get along and considered a friend. Whom i talked even after work via messages. But she liked to s#ittalk me behind my back, so i pulled away. I was thinking if you think im such a bad person then maybe i should taking a step back and reconsider who are my friends - i did not say anything to her about it but now she seems upset and does not even say hello to me :-/ She has not talked to me almost a year now. I dont know if i wanna be friends with her anymore but as coworkers we need to talk each other in order to work and should have common courtesy.

Thoughts?

She does not say hello anymore?
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