Analyze what terrible things Malcolm is saying about himself and how Macduff is trying hard not to believe his words. Why would Malcolm say these things?.

Macduff arrives at the English court and meets with Malcolm. Malcolm, remembering his father's misplaced trust in Macbeth, decides to test Macduff: he confesses that he is a greedy, lustful, and sinful man who makes Macbeth look like an angel in comparison. Macduff despairs and says that he will leave Scotland forever if this is the case, since there seems to be no man fit to rule it. Upon hearing this, Malcolm is convinced of Macduff's goodness and reveals that he was merely testing him; he has none of these faults to which he has just confessed. In fact, he claims, the first lie he has ever told was this false confession to Macduff. He then announces that Siward has assembled an army of ten thousand men and is prepared to march on Scotland.