Broken Promise and Relation

People always say an acquaintance will become friend in my case it was opposite......
Yes,me being a friend turned into an acquaintance.I thought she is one of a very few who understood me very well.But I am wrong.I didnt even know whether we have become strangers.I thought and believe that a friend can say anything,but that proved to be wrong in my case,may be i thought we have better understanding but than i am wrong again.Still I am not sure about this,as in a friend can say something,may I can take this as a lesson and will try to follow.I still cant figure out the reason as why this gap was created between us.I still fear that she in the wrong hands,all i pray is she will soon understand me,will get back to me with the same realtionship as we had.