A Destroyed Romance.

*Response to prompt #3: 

               The Duke was too jealous, too egotistic, and too proud to be with the Duchess any longer, due to the subtle hints and certain significant incidents described in the poem.  The beginning of the downfall started when the Duchess was being painted; he begins to say that she is too easily impressed (she takes people’s kind manners as something more), and quite lazy (she sits, obliviously, as the painter goes about his work busily).  Then he goes on to say that she gives him the same courtesy smile endowed upon everyone and anyone and blushes as men point out her enticing good looks, which frustrates and aggravates him.  So in attempts to keep her at his side the Duke starts treating her like a dog; ordering her around. Slowly, the smile that filled her face began to fade to the point where it was no longer there.  He then lost the Duchess altogether, and her whereabouts no longer include him by her side.