Post Workout Lapse

I did it with my client, just once. We were both alone after a session, locked in the changing room. It felt so forbidden, and yet... electric. I wanted her more than anyone else ever since day one. Our bodies fit perfectly; she was responsive to every touch, moaning into my ear as I made love to her. The guilt hit me hard when it ended, my wife would never understand this desire for someone else, even if we're both adults and consented. How do people deal with these urges without breaking their marriage vows? What’s your take?