find the lines where Othello is jealous of Desdemona and what it led to.

Othello:

Why, why is this?
Think'st thou I'd make a life of jealousy,
To follow still the changes of the moon
With fresh suspicions? Act 3 sc 3

Actually, Othello's challenge that he is not a jealous person a\actually means quite the opposite. He overdoes his challenge telling us he is very susceptible to being jealous