AITA for stop being this girl's friend and talking about her over a boy?

So basically my freshman year I became friends with this girl lets call her Emily as a code name. She seemed really nice and fun to be around, and we had the same 2 classes together. One day in PE class she asked me "is there anyone at school that you like?", I told her yes and then back tracked and said, "I don't really like him anymore."

Then a few days or weeks later I caught her at school messing with the boy I told her about. She was cuddling him and it made me uncomfortable. As a girl I believe in girl's code and think it's wrong to mess with a boy a friend tells you about. I felt betrayed and told my friends about how I am hurt about what she had done. To be honest I still kinda liked the boy and was in denial.

As summer was approaching I had cut her off but I didn't confront about what she'd done. During my sophomore year we didn't talk and I got over the situation. I pushed it to the back of my subconscious and didn't really care anymore. But during the summer she saw me at the mall with my friend and so summarize she basically asked to fight me. Her and her friend kept asking to fight me, I declined because I was confused.

Long story short her friend ended up hitting me, my friend jumped in, another girl jumped in, and the situation escalated. After the fights were over the girl embarrassed me in a group chat and said I was mad over a boy. What I was really mad about was that she betrayed me, and that she wasn't being a good friend. I know I shouldn't have talked bad about her, but was I in the wrong.