my boyfriend likes to watch!

So my boyfriend told me a few weeks ago that his fantasy would be to watch me get down with another guy (like live action porn!) I was into it, I would be performing for my man! Well, This weekend it happened! We were in our hot tub and I was all over this other guy.. Well now I just feel like a total slut over it.. Even though my man was and still is totally turned on and thought it was the most sexy thing he had ever seen! I still can't stop thinking about how I just cheated on my boyfriend of almost 4 years! Help me!! Opinions??