AITA for shunning my friend for talking bad about me behind my back
I had a friend (let’s call her Lizzo), we BEST FRIENDS for about 2 years. We did everything together, I slept over her house almost every weekend, we celebrating Christmas together, she was like my family. One summer I went away and couldn’t go on her family vacation so Lizzo brought our mutual friend (let’s call her Christine) instead. On the vacation Lizzo was ranting to Christine about how she thought my decisions were stupid and embarrassing. I liked to go out and party, drink (maybe too much at times) and she was basically talking sh*t about me for the whole trip. I had a ex at the time who treated me really bad and I was going through a lot at home and she told Christine a lot of information I told her in confidence.
So Christine told me everything Lizzo said about me and when we got to back school I literally acted like she was invisible. Every time she spoke I would pretend like I did not hear. If she asked I question I would say “did someone hear something”. She was a ghost to me. If someone came to me regarding her in anyway I would act like I had no clue who that was. Our friend group also all cut her off. IATA should I have said something or was my reaction valid?