If the Duke was unhappy with the Duchess’s behavior, why didn’t he make his displeasure known? Please cite a specific passage to explain why you think what you think.
There's one particular section of the poem which shows his reasons for not voicing his pleasure:
"She thanked men,—good! but thanked
Somehow—I know not how—as if she ranked
My gift of a nine-hundred-years-old name
With anybody’s gift. Who’d stoop to blame
This sort of trifling? Even had you skill
In speech—(which I have not)—to make your will
Quite clear to such an one, and say, “Just this
Or that in you disgusts me; here you miss,
Or there exceed the mark”—and if she let
Herself be lessoned so, nor plainly set
Her wits to yours, forsooth, and made excuse,
—E’en then would be some stooping; and I choose
Never to stoop."
His duchess would smile with equal pleasure at things which he sees no worth in (a sunset, a mule, some cherries) as she would at him. He felt that to have chastised her for such 'trifling' was beneath him ("Who'd stoop to blame...?") - and, as he later says "I choose never to stoop". He felt that to have reprimanded her for actions that he deemed to be a complete affront to his prestige would have been showing weakness. He also suggests that he did not have the skill with speech to have made his disgust with her clear - even though he manages to make it quite apparent throughout the poem.
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There's one particular section of the poem which shows his reasons for not voicing his pleasure:
"She thanked men,—good! but thanked
Somehow—I know not how—as if she ranked
My gift of a nine-hundred-years-old name
With anybody’s gift. Who’d stoop to blame
This sort of trifling? Even had you skill
In speech—(which I have not)—to make your will
Quite clear to such an one, and say, “Just this
Or that in you disgusts me; here you miss,
Or there exceed the mark”—and if she let
Herself be lessoned so, nor plainly set
Her wits to yours, forsooth, and made excuse,
—E’en then would be some stooping; and I choose
Never to stoop."
His duchess would smile with equal pleasure at things which he sees no worth in (a sunset, a mule, some cherries) as she would at him. He felt that to have chastised her for such 'trifling' was beneath him ("Who'd stoop to blame...?") - and, as he later says "I choose never to stoop". He felt that to have reprimanded her for actions that he deemed to be a complete affront to his prestige would have been showing weakness. He also suggests that he did not have the skill with speech to have made his disgust with her clear - even though he manages to make it quite apparent throughout the poem.
Hope that helps!