When My Kink Broke the Rules of Our Relationship

I've been in a committed relationship with Alex for five years now. We have an open relationship and established boundaries early on to avoid misunderstandings or hurt feelings. One boundary that we both agreed upon was no CNC (consensual non-consent) roleplay, as it doesn't feel right for us. However, I've recently discovered an interest in this type of scenario after reading some stories online and attending a workshop at a kink event. The concept intrigues me deeply, but it goes against our mutual agreement. Last weekend, while working the bar, a couple came in that evening who engaged in roleplay right there on their date night. They were discreet about it but there's something exhilarating about being around people who aren't just talking about their desires but actually acting them out. It triggered an urge within me to explore this forbidden territory with Alex. I've been struggling internally ever since, questioning whether I should talk about my new interest and risk pushing past our boundaries or suppress it completely and miss out on something that could enhance our relationship in ways we never imagined possible. The more I think about it, the stronger this desire becomes to explore these fantasies with Alex. I know talking about changing established boundaries is a big deal, but maybe there's room for discussion? Or should I just accept my desires as personal exploration and leave them out of our shared intimacy altogether? It's been eating at me nonstop. How do others handle such a dilemma when they discover new interests in their long-term relationships?