my best friend

Today is Valentine’s Day. I was informed that it was also considered as friendship day in Singapore, which evoked my memory of my best friend—Betty.
At our age of ten, we met each other. She had such a sunny disposition that I take to her at my first sight of her. During the four years when we studied in the same class, we chatted almost every break. It was a miracle for we actually did not have plentiful common interest. I reckoned that we were like Ba(OH)2 and CuSO4. Once we met each other, we cannot separate.
I continuously believed that our friendship was unbreakable. However, the fate was unpredictable. Everything began to change when we enter our senior school. We were still in the same class in senior school and there was another girl who was our classmate in junior school in our class. Since at first she was strange to all the classmates except us, she joined us and played with us. At that time both of them boarded at school but I lived at home. As they did not have such experience before, plenty of problems confronted them. They could not stop missing parents, hardly to tolerate the crowd when bought meals and felt uncomfortable to live with eight people. I was not competent enough to understand these troubles. Hence, they were at the same boat, cooperating and comforting each other. With time going by, it seemed that I could not fit into them. I valued the friendship too much that one day I asked her directly “it seems that we are not as intimate as before.” I pushed her into embarrassment which I did not mean to.
After that, she became cautious when we were together. I understood her good intentions but the relationship became strange. There was less and less happiness left. We became estranged from each other.
In my heart, the reason why we get this position is that we care each other too much. She is my best friend, not only in past but also at present.