Act 2 scene 1

I can not figure for the life of me why would Iago say such things about his wife and our captain's wife as well its unforgivable. To say that is wife only lazy until they are in be is not only slanderous but truly despicable for he shows no love nor respect when he speaks to her but lo' and hold the captains wife he banters with with such respect in his tone of voice. But finally my captain has h come from such a long forsaken war alive and victorious he tells us that the gods must be on our sides for the turks ships were swept away by the sea and that the war is finally over and he has come back to his lovely and beautiful wife Desdemona and his subordinates that he has trained and shows him such admiration.