Has Desdemona cheated on me? She keeps asking me to reinstate Cassio... could this be a connection?
MAN vs SOCIETY
Iago tries to kill Cassio, motivated by anger over a promotion which Cassio received instead of Iago.
Othello questions Desdemona's devotion, and eventually loses his battle to keep this jealousy in check.
Othello is a Moor. The prejudice and racism of his society makes others suspicious of him. They do not understand how he is a general, and how he won the love of Desdemona.