how does it feel when u get scolded for no fault of urs?

When I am blamed for something that I did not do, I feel really bad and angry that no one believes my innocense. One example: I was working at this job, and my manager called me to question me about a credit memo that was entered. I told her I had no idea what it was. She said, YOU ARE THE ONLY ONE THAT DOES THIS FUNCTION. I tried to tell her that people from the billing department also made these entries. She finally decided to look up who did it, and saw that it wasn't me, she only said, OH, xxxxxx did it. XXXXX, was one of her favorite people at the job. She never apologized to me. Every time a mistake was made, I was blamed, turned out it was not me, she would cover for her friends instead of approaching them. Final straw, I was laid off, because she said I was making too many mistakes. One other co-worker, who was really friendly with the boss, and knew that I was doing my work correctly did not even come to my defense, and watched me get laid off for no reason. I refuse to speak to her anymore, because if she was my friend she would have stood up for me, but she didn't.