Othello had it all; a beautiful wife and a respect until he threw it all away.
Five Tragic Hero Characteristics
Believing in Iago more and not his wife. He allowed Iago to set up his wife with handkerchief and did not even give her the grounds to explain or to look for it.
His love for his wife- which he stole away from her father- ran so deep that he was unable to pass logic. He allowed his advisers to convince him his wife he had just married was already cheating on him. The thought pained him so much so that he would rather kill than see it be true.
He started off as a high, respectable general, but ended up in disgrace- he managed to maintain a little- and lay dead beside his wife; both lives he had taken. He was known as a gentle, kind man, but let deception creep into his mind creating a monster.
Only after his beloved wife was dead, after Iago was outed, and before he committed suicide did he realize that all of the events were his doing, and at his fault. He believed others instead of his wife, and he allowed their poisonous words into his mind and heart.
Iago hated Othello from the beginning of the story. He believed he had slept with his wife, and he actively sought to take down and destroy Othello.