Took A Risk For My Kink

I'm a professor in my 40s with a partner who doesn't share my fetish for dominance. We were at a party last weekend, and I couldn't resist the buzz of power play when another woman's eyes met mine across the room. She was alone, looking lost but intrigued. Our conversation started innocently enough, but soon we were talking kinks, hers mirrored mine perfectly. I proposed an impromptu scene in a quiet corner of the house. It felt risky and liberating at the same time. When she agreed, it was like fireworks went off inside me. We slipped away for half an hour, and it was intense, I took charge, pushing boundaries we both knew were safe to cross. Now back home with my partner, I'm left with this gnawing guilt. Did I cheat on him? I haven't kissed or slept with anyone else. But I do feel a deeper connection to that woman than I intended. What does it mean when you explore your darkest desires outside your relationship?