Betrayed by my best friend

I was born on the 16th of January not knowing it is the same with my best friend. We live close to each other and do everything together. We behaved like twins and we wear the same thing. She was my sister and I trusted her with everything about me. When she came to our house on a Sunday evening she saw my parents fighting and I didn't want her to see or know anything about my parents issues. She promised me not to tell anybody and I believed her. There was this boy in our school she fell in love with he didn't show interest in her but in me. I tried my possible best to avoid him so it won't leads to a fight or disagreement between me and my best friend. During closing hours we sat in front of the school building waiting for our parents when the boy arrived and ask me for my number and also for a date. I refused the boy but my best friend was angry I didn't get why she was angry. The next more I noticed she didn't wait for me when going to school and when I tried to talk to her during school hours, she paid no attention me. I was walking in the school hallways when I bopped into the boy and our lips mistakenly touched and my best friend witness the whole scene and I tried to explain to her it what she is thinking. She got furious and started shouting at me and the all school surrounded us. She abused and called me a pretender that my parents are bankrupt and on the verge of divorce and I still behaved like a rich girl. I was humiliated by her and shaken. She stopped talking to me and started hanging out with some new set of friends. I was betrayed but I had so move on.