Othello realizes that Iago has manipulated him, it is too late. He doesn't feel as though he completely fits in to the Venetian society and this leads to feelings of insecurity where he sees himself as an outsider.
This description enables the reader to view the outcome of the play as rationality's win over emotion, however as the idea of romanticism and rationality versus emotion did not develop in literary criticism until the eighteenth century, caution must be used when applying these values. He then plays on this weakness by making him appear an irresponsible alcoholic, Tis evermore his prologue to sleep. Normally, Shakespeare's tragic characters establish a pattern connected to their tragic flaws, and there really is no pattern to justify jealousy as a flaw with which Othello has constantly struggled). Shakespeare wrote about thirty-seven plays during his lifetime. The villainy of Iago is very effective in making Othello believe the lies and deceptions. This again links with the society at the time's obsession with reputation. Later in that scene he proceeds to smother her to death. Iago had never given Othello any reason to deem him untrustworthy before as honest as I am, so Othellos naivety is somewhat understandable. Who is responsible for Othello's downfall?