If someone expresses "rue," they might be feeling a sense of

To feel "rue" means to experience deep regret or sorrow for something that has happened, often associated with a sense of profound disappointment about a past action or decision. When someone expresses rue, they are reflecting on missed opportunities, mistakes, or actions that have led to regret. In this context, it aligns perfectly with the idea of feeling sadness from a wrong done, emphasizing the emotional weight of remorse. This captures the essence of ruefulness, where the individual recognizes the gravity of their past choices and the resulting emotional pain.