AITA for ending things after learning my girlfriend rehearsed my public humiliation?

At my girlfriend’s best friend’s engagement party, she laughed over her champagne and told everyone I was “just the guy who never got the message.” I said one sentence, walked out, and stopped paying for the life she claimed she had built alone. 10 days later, her sister sent me screenshots showing that the entire scene had been rehearsed. ---------------🦖D - Stories🦖--------------- #reddit #stories #redditstories