My GF and I are both 26, and live together in a major US city. During the COVID lockdowns, I finally worked up the courage to come out as a cuckold to my GF of 6 years. While she was supportive of me, she told me from the start that she couldn’t ever sleep with another guy if she was in a relationship with me, but she was more than happy to roleplay it. I didn’t even know if I could handle making it a reality so I was totally okay with just roleplaying it. I was so thankful for how supportive she was and how willing she was to explore the fantasy.
About a year after I confessed, she started mentioning this guy Eli that she met through one of her friends at work. Eli and her friend went to college together. I had met him a few times, and kinda thought he was an asshole. Initially, it was totally harmless and I didn’t think anything of it. She talked about him in a way that made me really jealous, but also extremely turned on. A few months later, she asked if I would be okay with incorporating him into our roleplay. I was all for it. Over the next couple of months, he became the center of our sex life, and she confessed that if we weren’t together she would totally date him. Hearing this hurt, but I was also so turned on by it.