I heard Cassio talking about Desdemona in his sleep.
Othello and Desdemona get married, Othello makes Cassio his lieutenant, Iago gets mad because he isn't the lieutenant and he thinks that he deserves it more.
I can not go back, I must kill her
Iago hates Othello because of him not being the lieutenant, and other things.
Willow Willow Willow
When Othello gets the proof of the handkerchief, and he is also told Cassio has been talking about Desdemona in his sleep
He says he is going to kill Desdemona, and agrees with Othello over it.
The falling action is when Desdemona is singing the willow song. This foreshadows her death. This foreshadows her death because her moms maid sang the song, and then died.
This is when Desdemona is killed and everything is revealed. This makes Emilia mad, and protest, and then get killed. Othello then kills himself because he believed all that is said. Iago is put in prison and tortured.