Why does Othello accusing Desdemona of cheating an act jealousy?

Othello accusing Desdemona of cheating is considered an act of jealousy because of his excessive and irrational fear of being betrayed by her. Throughout the play, Othello's emotions drive him to suspect Desdemona unfaithfulness based on mere suggestions and circumstantial evidence. This suspicion, fueled by Iago's manipulation and his own insecurities, consume him with the green-eyed monster of jealousy, leading him to jealousy accuse his innocent wife of infidelity without concrete proof.