For she had eyes, and chose me. No, Iago;
I’ll see before I doubt; when I doubt, prove;
And on the proof, there is no more but this, –
Away at once with love or jealousy!

– William Shakespeare

Othello, Act 3, Scene 3. Othello reassures himself that he has no need for jealousy of Desdemona since she saw him for who he was and chose him for a husband. But when he talks of needing evidence of Desdemona’s cheating before he no longer loves her, he appears to consider the possibility of being wrong about her fidelity. Is Othello already on the way to believing Iago’s lies? He certainly seems to be.