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I am so sorry this happened to you! I too had a friend whom I cared for much like you did yours. Out of nowhere as I became ill with my depression she began too dislike me. I considered her like family. I know it has to be painful for you and I am not sure what your faith is but I told myself along with some of my closest friends that "God knows the truth"
I am not sure why people do what your friend did and I cannot answer to what mine did but I have learned you can only feel sorry for people like that because in the long run they will find they ruined the most important thing in their lives and that is your friendship and trust.
BIG HUGS
Cher