Macbeth is presented as being disloyal. For example, he says "Stars hide your fires, let not see my black and deep desires". This suggests that Macbeth wants to hide his true evil intentions from both others and himself, he knows that murdering a king is wrong but he's trying not to tell himself that. You can see here his loyalty starts to waver.
Macbeth is presented as a war hero. The Wounded Captain describes how brave Macbeth was while slaying the enemy. The captain says "For brave Macbeth- well he deserves that name" During the battle against Norway, Macbeth proved his loyalty to King Duncan and his bravery by slaying his enemies. Fighting bravely for your country was seen as a great sign of loyalty.
Macbeth starts to consider murder however at this point he still has a conscience so he's weighing up the pros and cons. He says" If it were done when 'tis done then twere well if it were done quickly" Macbeth contemplates the murder of Duncan however he has doubts and fears. The murder must been done sooner or later before he becomes timid.
Macbeth is considering murdering Duncan. Macbeth has "no spur to prick the sides of my intent, but only vaulting ambition which o'erlaps it" Macbeth has no justification for the crime because Duncan is a good king and his relative, he can only use his vaulting ambition (desire for more power) as a reason to murder Duncan, however he knows it's not good enough.
Macbeth has come to the conclusion that he must murder Duncan. He says" False face must hide what the false heart doth know". Macbeth decides to murder Duncan but in secret and he needs to act as innocent as possible. It means Macbeth must put on a false face to hide what his traitorous heart knows.
Just before Macbeth is about to kill Duncan he starts to hallucinate. In his soliloquy he says" I see thee still, and on thy blade and dudgeon (handle) gouts of bloods, which was not so before: its bloody business which informs thus to mine eyes".