Montresor appears to be concerned about Fortunato’s health because he wants to maintain a ruse of friendship, and even admiration, so that Fortunato does not become suspicious. Montresor has carefully plotted a meticulous revenge on Fortunato to ensure that Fortunato knows who has brought about his demise and to ensure that Montresor will face no negative consequences for his revenge. Anything less, he feels, is not real revenge. Montresor says,
It must be understood that neither by word nor deed had I given Fortunato cause to doubt my good will. I continued, as was my wont, to smile in his face, and he did not perceive that my smile now was at the thought of his immolation.
If Montresor begins to treat Fortunato as an enemy, then Fortunato might be on his guard and become more difficult to deceive. So, Montresor continues to treat Fortunato as a friend, and friends care about the health of their friends.
In addition, by continuing to recommend that Fortunato protect his health and...
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