Cawdor has confessed to treason and is executed you can never tell what a man is thinking about by his facial expressions
Act 1 Scene 5
lady Macbeth is worried about if he will be able to become king, she sees him as too weak to hurt someone for the crown, he is a honest and good man does not want to cheat but it seems like that is his only option.
Act 1 Scene 7
Lady Macbeth finds out that the king comes to there home tonight, when she is alone she thinks to herself this is their chance to strike and kill. She asks the spirits to make her less of a woman, so she can commit this evil act and not think twice about it.
Lady Macbeth tells Macbeth that they king shall never leave She tells Macbeth wipe that look off your face you need to look clueless and that tonight will be a new beginning for them as he will be the king now.
Macbeth is questioning if he should kill him or not, lady Macbeth is upset because they already spoke and he decided so she comes up with the plan wait till he sleeps and kill him and frame his guards