Gerald has been cheating on you with your best friend for sometimes without your knowing, because you are blind. He also thinks you are easy to be fooled due to your disability. Gerald actually has been feeling unsatisfied with this marriage since he is the one who handle everything. He needs a real love, not an invalid like you. Gerald pulls the most hurtful words when expressing his actual feelings towards you, that he feels disgusted and cursed to be a husband of a blind person.