This is a wonderful question! No one ever thinks all that much about Mr. Mallard. I am going to speculate, based on the story itself and the time in which the story took place, that Mr. Mallard, had he known of Mrs. Mallard's thoughts, would have been at least mildly offended and assumed something was wrong with his wife. I find it highly unlikely that he would have been sympathetic.
The part of the text that makes me think this is as follows:
There would be no powerful will bending hers in that blind persistence with which men and women believe they have a right to impose a private will upon a fellow-creature. A kind intention or a cruel intention made the act seem no less a crime as she looked upon it in that brief moment of illumination (para. 12).
This passage tells us that Mr. Mallard had a...
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