I dreamed of her cheating on me last night.

She was wearing a very short red vinyl outfit, showing her tits, ass and pussy because it was so short. She met old hookers and kissed them in front of me while they took advantage of her. I'm not a cuckold yet but it was the best dream I've ever had.

Dreams are dreams, and if they make you horny, may be an indication of an inner desire, but they are only dreams. If you wish to make them reality you should, no must share them with her, and talk about how they make you feel and what she thinks of your dreams and feelings, you have planted the desire and put the ball in her court, if she shares the same desires, or she wishes to please the man she loves perhaps she will put them into motion!
Are you sure you are ready to make your dreams a reality?