In the scene described, the protagonist demonstrates remarkable composure as he halts the escalating accusations from his betrothed. Instead of engaging in a heated argument, he chooses to kiss her, which surprises the situation and shifts the focus away from their conflict.
This unexpected action leaves his fiancée feeling disillusioned with him, as she perceives him to be beyond redemption. Consequently, she decides to refrain from further attempts to address his perceived failings, at least for the moment, indicating a temporary suspension of her indignation.