Lady Macbeth Act 3, Scene 2

I believe Lady Macbeth is going to be quite surprised by what her husband is up to. She thinks it is wrong for him to be alone because he is surround by such depressing thoughts. She wants to make sure that he has let go of any regret or guilt he has for Duncan's murder. She thinks it is only appropriate for him to look happy when he is surrounded by others. She wants to see this at the dinner, especially. She has concluded that he must not dwell on the murder because he cannot change it now. It is also obvious that she supports the idea of killing Banquo and his son. She thinks it is necessary to maintain their security and happiness.