When someone threatens to kill you gleefully, you believe them and go to the police or seek a mental hospital that has involuntary in-patient treatment. Not cheat on them when you know that's their trigger. She literally handed him a gigantic neon sign that said cheating is one of her triggers. At this point, not only is he unlucky enough to have caught her attention, he was stupid enough to walk right into his own death.
When someone threatens to kill you gleefully, you believe them and go to the police or seek a mental hospital that has involuntary in-patient treatment. Not cheat on them when you know that's their trigger. She literally handed him a gigantic neon sign that said cheating is one of her triggers. At this point, not only is he unlucky enough to have caught her attention, he was stupid enough to walk right into his own death.