.... Adultery or Just a Night Out?

I've been engaged to Sara for two years now. Last week, I went out with my friends and hit the clubs, but things got messy when I met this gorgeous girl in her twenties who was into CNC roleplay. We ended up back at her place for a night of heavy, consensual roleplay that left me questioning everything... Did I cross a line by pushing boundaries like this? Is it normal to feel so guilty after just one night?