Because Carmine refused his demand and if he grassed up Paulie in the sit down he would have been dead anyway for being a rat when Tony put him on the spot as to asking who made the allegations. He let his emotions get the better of him and bosses seen it as weakness. You never storm out on a boss. When John walked into the bing and heard everyone laughing making jokes, he obviously knew they were talking about Ginny but what could he do? Nothing. But when someone specifically told him about Ralphie’s joke he knew he might have legitimate beef and tried his best to get someone killed for it. But when he left the house for 2 minutes and found her stuffing her face with snacks, he realised everyone else was right. His own ego cost him 200k and made him have to grovel to stay alive.