Isn't it strange how people see things differently.
I have always thought that it was the envy of Iago that drove the play. Iago is envious of Cassio and to a lesser extent of Othello too.
Othello is lacking in self-confidence, doesn't really think he deserves to have such a beautiful wife as Desdemona, then easily convinces himself , with lots of help from Iago, that Desdemona does not love him and has betrayed him. Proof positive to him that he is not worthy. Then comes his anger at her, as she is the proof of his failing as a man, so she has to die.
So I'd agree that one of the conventions of tragedy is that the tragic hero must die because of his flaws, but I'd say Othello's flaw was inability to believe in himself and his abilities rather than jealousy.
Hasn't really answered your question, but I'm sure you'll find the link that factor 30 directed you to very useful. As well as reading the play, I'd try to watch it either on stage if possible or on DVD. Shakespeare is pretty dry on the page, but well acted or even moderately well acted, it really comes alive.
Good Luck.