who has read othello?

Question

why does iago bring up the fact that cassio and desdemon are friends?

Answer 1

Othello and Desdemona marry and attempt to build a life together, despite their differences in age, race, and experience. Their marriage is sabotaged by the envious Iago, who convinces Othello that Desdemona is unfaithful.
Iago tells the audience of his scheme, arranges for Cassio to lose his position as lieutenant, and gradually insinuates to Othello that Desdemona is unfaithful by telling him of her "friendship" with Cassio.
In an attempt at reconciliation, Cassio sends some musicians to play beneath Othello’s window. Othello, however, sends his clown to tell the musicians to go away. Hoping to arrange a meeting with Desdemona, Cassio asks the clown, a peasant who serves Othello, to send Emilia to him. After the clown departs, Iago passes by and tells Cassio that he will get Othello out of the way so that Cassio can speak privately with Desdemona. Othello, Iago, and a gentleman go to examine some of the town’s fortifications.
Desdemona is quite sympathetic to Cassio’s request and promises that she will do everything she can to make Othello forgive his former lieutenant. As Cassio is about to leave, Othello and Iago return. Feeling uneasy, Cassio leaves without talking to Othello. Othello inquires whether it was Cassio who just parted from his wife, and Iago, beginning to kindle Othello’s fire of jealousy, replies, “No, sure, I cannot think it, / That he would steal away so guilty-like, / Seeing your coming” (III.iii.37–39).
Othello becomes upset and moody, and Iago furthers his goal of removing both Cassio and Othello by suggesting that Cassio and Desdemona are involved in an affair. Desdemona’s entreaties to Othello to reinstate Cassio as lieutenant add to Othello’s almost immediate conviction that his wife is unfaithful.

Answer 2

Iago wants Othello to think that Desemona and Cassio are having an affair.

Answer 3

The basis of the average mind's jealousy! Shakespeare indeed was a master of human mind's machinations!

Answer 4

No but is it a good book?