The above supports the idea that he is not (at the opening of the play) a jealous mad man. He has convincing self-esteem, which he later loses to the deception of Iago's evil ploy. .
This is evident in Act III scene iii, when Othello says he thinks Desdemona is honest, and yet, in the face of "Honest Iago", thinks she is not as well. This becomes painful for him, (not knowing what to believe) and his mind is torn with images of Desdemona's infidelity and his own unworthiness. Once a master of self-knowledge, Othello is reduced, by Iago, into a gullible and helpless tool. .
Othello does realize the flaw of his gullibility at the end of the play, and knowing he has been deceived, attempts to kill Iago. Riddled with guilt and his fall to Iago's deceptiveness, he states this realization and takes his own life, clinging to Desdemona. His awareness, come late, is his enemy in life and reduces him from a man of wisdom and self-esteem to a man who takes his own life.
Titus, on the other hand, does not follow classic tragic style and dies without seeing the error of his ways. He does, however, possess some degree of self-knowledge.
Titus Andronicus is a man who is intensely committed to his own code of ethics, even to the point of sheer stubbornness. Early in the play, Titus shows no mercy for the lives of Alabarus and Mutius (his son). His attitude reveals the anger of an egoist who will be denied nothing. Although there is much in his character to admire, Titus lacks a basic humanity and a willingness to admit that he is wrong. .
An onslaught of tragedies facing himself and his family causes a psychic metamorphosis in Titus that makes him a barbaric and obsessed man. His capability for violence, which had only been glimpsed before, is completely unleashed in the final act of the play. Any trace of humanity that might have still existed in him is totally wiped out by his darker passions, which seem to have taken complete control of him.
