Why are people so dumb?

Another wild r/AITAH Reddit story! Today’s post dives into a messy situation between a young couple who agreed to an open relationship after long-distance made things difficult. The girlfriend (22F) stuck to every rule they both set, honesty, protection, no emotional ties, and informing within 48 hours, only for her boyfriend (22M) to explode, accuse her of being “cheap” and “easy,” and then break up with her. He even started telling their friends she cheated, despite him being the one who suggested the open relationship in the first place! Was this just manipulation? Was he testing her loyalty the whole time? Or is she truly in the wrong? Let’s break it down together and decide