is there forever friendship in my life?

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i ever had a very good friend when i was in middle school. at that time, we often played and studied together. as time went on,we became the best friends. now,almost ten years past,i find that there are more and more different ideas between us. i cherish our rare friendship very much and often keep in touch with her.but i find that the friend who ever was my best friend now is becoming more and more cold to me.i wonder if i should always keep in touch with her.is there forever friendship in my life?