Act 2 Macbeth: He's confused, ruthless, and not loyal to the king anymore. Confused-"is this a dagger which i see before me." Not loyal to the king- "Hear it not, Duncan, for it's a knell that summons thee to heaven or hell."
Act 2 Lady Macbeth: She's strong, ruthless, and still in charge. "Give me the daggers. The sleeping and the dead are but as pictures."