AITA for leaving the relationship after my girlfriend treated me like her backup plan?

At a couples’ dinner, my girlfriend laughed and told everyone, “Jonathan knows what this is. He just likes pretending it’s more.” I smiled because she thought I would take it quietly, just as I always had. 2 weeks later, when she joked that I had finally learned to relax, I set down my glass and told everyone at the table exactly why I had stopped asking. ---------------🌞Sunny Stories🌞--------------- #reddit #stories #redditstories