Why doesn't Macbeth confide in his wife in act 3, scene 2?  

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The fact that Macbeth conceals information from his wife can be interpreted in two basic ways. One interpretation is that he is trying to spare her feelings because he thinks she will be upset about killing their allies. This interpretation is implied because he mentions that she should remain “innocent.” A reason to doubt this, however, is that in her earlier advice to him, she had mentioned looking like an “innocent flower” to disguise that one is acting like a serpent. Therefore, he might be saying that she should pretend not to know what is going on around her, rather than his just wanting to conceal this information.

Another, different way to look at his caution is that he does not quite trust her to back his plan. Up until this point, they have operated hand in hand, but it has been Lady Macbeth goading him to action. The blood on his hands seems to be motivating Macbeth to commit further violence. He may understand the need to keep his plan secret from his wife because he knows deep down it is not a good plan, and she will try to talk him out of it. In this line of thinking, as up till this point they had succeeded because they backed up each other, this breach of confidence marks the beginning of both their downfalls.

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In Act 3, Scene 2, Macbeth does not share with his wife that he is to have Banquo and his son murdered. He keeps this information unknown to Lady Macbeth. He does suggest that something has to be done for Banquo knows too much. When Lady Macbeth asks what he plans to do, Macbeth refuses to tell her. He appears to be protecting her innocence:

Be innocent of the knowledge, dearest chuck,(50) 
Till thou applaud the deed.

Clearly, Macbeth does not want his wife to be involved in the murdering of Banquo and his son. Macbeth seems to be protecting her from the horrible images associated with the murder of Banquo and his son. Perhaps, Macbeth realizes that he has already brought out the monster in Lady Macbeth. This time he wants her to be innocent in the murdering of Banquo and his son. Macbeth seems to be taking the total responsibility for this murder. He is trying to keep her innocent until she can "applaud the deed." Macbeth feels confident that she will, as he puts it, "applaud the deed." This proves that Macbeth was not worried that she would object to the murdering of Banquo and his son. The reader only has the one line that states that Macbeth is protecting Lady Macbeth's innocence. He does not desire for her to have to feel guilty over yet another murder. He shoulders this murder alone. 


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