I’m a gay man and I’ve recently started seeing a guy in an open relationship. He’s intelligent, funny, and sexy. He told me early on that his partner is a Dom top, into kink (leather, latex, etc.), that his partner has caged boys, and so on. Moreover, with his partner he’s a “bratty sub,” meaning he engages in erotic disobedience and defiance. I was indifferent to this initially, but I have begun to become aware of his partners presence in a way I don’t like, even though I’ve never met the guy. I also find myself feeling resentful and jealous of the idea of him being told what to do, held back, or controlled. (The sex we have is hot, intimate, and intense, as well as completely vanilla.) I know his relationship with his partner is none of my business, but if he truly is a bratty sub,...