Why Did I Cheat?

I married Sarah six years ago and we have a beautiful life together. For the past two months though, I've felt this nagging urge to explore something new. A friend introduced me to an online platform for anonymous sexual confessions, and one night, after hours of browsing other people's stories, I stumbled upon someone who shared my exact kink: role-playing as a submissive in a BDSM scenario. The next day, I reached out to them under the guise of curiosity and our conversations quickly turned intimate. Before I knew it, we arranged to meet at a hotel for a night of exploration. It was exhilarating and terrifying all at once; everything about it felt both incredibly liberating and deeply wrong. Afterward, I couldn't help but feel conflicted, did this mean there's something lacking in my relationship with Sarah? Is she the right person for me? I'm not sure what to make of these feelings or whether I should confide in her. Have others been here before? How do you reconcile secret desires with a committed life?