Playing Both Sides - A Complex Decision

I've been in an open relationship with Sarah for a year now. It's always been clear that monogamy wasn't working for us, and we agreed on the openness from day one. But lately, I’ve started something new: meeting men outside of our arrangement to explore different dynamics. The idea was initially terrifying but gradually became intriguing as an escape from our daily routine. Sarah is a dominant woman who thrives in control. She takes charge in every aspect of our relationship, and although I enjoy her dominance during sessions, the thought of taking charge elsewhere with another person is exhilarating. It's not that I don't appreciate Sarah; she’s amazing, but sometimes being submissive gets exhausting. A couple of weeks ago, I met a guy online who was interested in a power exchange scenario where he would be on top. I’ve never done anything like this before and it felt daring, even dangerous. We agreed to meet anonymously for one night only. It wasn't just about the sex; it was the idea of having someone else guide me through a different kind of intimacy. After that encounter, my mind has been racing. Am I betraying Sarah? Or am I just exploring what's possible outside the strict framework we've built together? The guy and I haven’t talked since, but his impact on me lingers. I find myself questioning every aspect of our relationship - from how often I see him to why I crave this kind of control. I feel torn between my love for Sarah and a newfound curiosity that’s hard to deny. Am I the asshole here? Is there something wrong with what I’m doing, or is it just part of being human and exploring who you are beyond set boundaries? What do you think - am I going too far? How should I address this with Sarah?