in what ways do you think othellos greatness of heart led to his own downfall

The greatest irony of the play is that it is only after killing Desdemona that Othello learns the truth about her; he finds out that she was blameless, and that Iago was manipulating him into believing otherwise. Still, even after the murder is exposed, Othello cannot let go of the idea that Desdemona really did cheat on him; but his fixation on the handkerchief is ended when Emilia reveals how the token was used to make him believe in the affair. His pride and greatness refuse to let him believe that he could have been wrong.