Yup. Growing up my best friend was heavy. She would start catfights with any other friends I have and force me to choose between her or them (I wasn't allowed to have multiple friend groups or hang with other people without her). I really loved basketball. Whenever she went to play with me she would have me face the basket to get her rebounds, then half the time she would randomly chuck the ball as hard as she could at the back of my head when my back was turned. I remember going back to visit my 4th grade teacher when I was in high school. He asked me if I was still friends with her. I told him no, she stopped talking to me after middle school. His face lit up and he congratulated me. It took me that long to realize what an asshole she was to me. I had thought it was all totally normal.