sad T.T

I have one best friend ... she is a friend that know me vry well ... i know her from 5 years old ... she yesterday say will ignore me ... i so sad ... i dont noe wan how now ... today at school she no look at me n no talk v me once ... i so sad ... did i do wrong any thing ? y wan treat me like tis ... i now just noe de feeling tat ignore by a person tat u really care ... so sad ... T.T