Open Relationship Dilemma

Working at a small boutique has its perks and drawbacks. One perk was the manager, who had eyes for me since day one. It was clear he wanted more than just friendship or professional respect. In my open relationship, it’s not uncommon to explore connections like this, but I’ve never actually acted on anything before. Last week, we were closing late and the moment felt right. We talked about our boundaries beforehand, everything was consensual. After that, things got heated in a back room away from cameras. It was intense and passionate, nothing short of thrilling. But now I’m second-guessing myself. Is this normal? What if my partner finds out? Should we keep it under wraps or be more open about these flings? Any advice for navigating this?