How should I act with her tomorrow ?

[The Betrayed]

Ok, I have this "friend" who was again acting mood with me on friday, she would look away evertime I spoke to her. She was just acting totally unfair to me when she with her other friends and stuff...but at the end of the day, she was talking to me okish I guess. But anyway, she is really two-faced and stuff and the last time I fell out with her, she basiclly bullied me until it got to the point where I couldn't deal with it. But anyway, how should I act around her tommorow ? Should I just leave her alone and keep away from her and avoid being near her ? Or should I say hi ? I don't know because maybe if I let her cool down, she won't fall out with me but ... I don't know. I'e had a really bad year and I don't know how many Sunday nights that I've spent worrying the next day because of a friend. I've lost all my friends this year.....help?