Macbeth's guilty conscious began getting to him as he starts hallucinating Duncan's ghost, making himself more worried. He begins to lose himself and talking nonsense, "But now I am cabined, cribbed, confined, bound in/To saucy doubts and fears"(3.4.24-25). As play progresses, Macbeth can be perceived as naive for falling into the pressure of becoming king, although it goes against his morals.
Once again, Macbeth is easily pulled into the trap of the three withes as they tell him he cannot be stopped by anyone born from a woman. By chanting, "Double, double toil and trouble;/Fire burn, and cauldron bubble"(4.1.35-36). By casting this spell, the witches hold Macbeth in a trap where he is easily manipulated and he can no longer be in control of his actions, making Macbeth fall victim to the witches.
As the play comes to an end, Macbeth comes to the realization that he was tricked as he shouts, "That palter with us in a double sense,/That keep the word of promise to our ear/And break it to our hope" (5.8.20-22). The point of realization made him see that what he's done, was because he was guillable, seen when his conscious punished him from doing wrong.