All in all, it's a pretty standard story of emotional manipulation. Bingtang was more popular than Kyouka, so he repeatedly took advantage of her connections and used her for free labor; she basically became his unpaid manager. He flirted with other girls, went to brothels, and reused their phone sex conversations for yumejo-pandering streams, and when she called him out for it, he claimed it was her responsibility as a girlfriend to support him and reframed it so she was the controlling, emotionally unstable one.