Late Night Experiment

I met a guy online who shared my interest in impact play. We arranged to meet and try it out. I felt guilty but couldn't resist. My husband doesn't share this kink, so we never explored it together. The sensation of the paddle against my back was thrilling yet scary. Afterwards, I felt confused, did I cross a line? Should I talk to my partner about trying new things or just keep this secret? What do you think?