Final answer:
King Duncan felt betrayed by the original Thane of Cawdor due to his treason but was pleased to bestow the title onto Macbeth, who he believed was honorable and deserving.
Step-by-step explanation:
Duncan, the King of Scotland in Shakespeare's Macbeth, initially had a favorable opinion of the original Thane of Cawdor and trusted him. This is evidenced by Duncan's surprise and betrayal when he learns of Cawdor's treason.
When it comes to passing judgment on the treacherous Thane, Duncan declares, “No more that thane of Cawdor shall deceive”, making it clear that he felt betrayed by someone he once held in high esteem.
Upon learning of Macbeth's bravery in battle, Duncan bestows the title of Thane of Cawdor onto Macbeth, indicating his satisfaction with Macbeth's loyalty and valor.
Duncan's feelings of joy for Macbeth are articulated when he says, “What he hath lost noble Macbeth hath won”, suggesting that Duncan believed the honor of the Thane of Cawdor title was restored by giving it to a deserving individual like Macbeth.