What light is shed on Macbeth's character through his interactions with the witches, Banquo and Macduff?

What light is shed on Macbeth's character through his interactions with the witches, Banquo and Macduff? Macbeth explores the deterioration and disintegration of a tragic hero who fails to make the right moral choices in life. We must look into the other characters that influence Macbeth into taking the path he chose to take. In particular the witches and Lady Macbeth played a major role in his downfall. We do see in the end though, …

…controlling, persuasive wife. Macbeth feels insecure after the murder and feels like it is him against everyone else. He has become unstoppable with his harsh actions and plans on getting rid of anyone that he suspects might interrupt his journey to the throne. He has grown distant from Lady Macbeth and feels that he cannot trust anyone. I think that Macbeth must have regretted what he did, but he realized there was no turning back.