When Macbeth intends to kill Banquo, he doesn’t inform Lady Macbeth of his plan. Explain why he does this and how the relationship between the two Macbeths (Macbeth and Lady Macbeth) is changing?

Macbeth's decision to kill Banquo represents a sea change in his relationship with his wife. Prior to this pivotal moment in the play, Lady Macbeth was very much her husband's partner in crime. She was the one who cajoled him into murdering Duncan, carefully preparing her dastardly plot down to the very last detail. Yet when it comes to killing Banquo, she's out of the loop. Macbeth doesn't explicitly let her in on the specifics of what he has in store for Banquo and his son, Fleance, but he drops more than a few hints at what's to come:

Be innocent of the knowledge, dearest chuck,Till thou applaud the deed (act III scene ii).

Lady Macbeth is no less aware than her husband of the danger that Banquo and Fleance present to the throne that the Macbeths have worked so hard to secure. But even she doesn't try and finagle Macbeth into having them murdered, as she did with Duncan. Yet that was a different matter entirely. Assassinating Duncan was an act of political ambition; ruthless, yes, but certainly nothing out of the ordinary. Getting rid of Banquo and his bloodline, however, is more to do with thwarting the witches' prophecy. In other words, there's something dark and supernatural about Macbeth's plot in a way that simply wasn't the case with Lady Macbeth's.
The fact that Macbeth chooses to keep his wife in the dark about his plans is instructive. He no longer needs her; theirs is a power relationship no more. Macbeth has had his head well and truly turned by the witches' prophecy, and nothing can stop him. There's something truly diabolical about his bloodlust, about his desire to destroy anyone who might conceivably be a threat to this throne. Killing Duncan, though an act of murderous treachery, did at least have a certain logic to it. And it was Lady Macbeth who supplied that logic, providing her husband with good reasons why it was necessary to proceed with such a devious plan.
But once Macbeth's ascended the throne, all the various murders he subsequently commits are much harder to justify. As far as Macbeth's concerned, this was all fated; he's acting out the role assigned to him by dark, malevolent forces. Lady Macbeth, however, isn't part of the prophecy; she's already played her part in helping her husband to get what he wants and so can easily be sidelined.

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