I'm with Tonberry. Tell him now. Talking and joking about poly are one thing...fucking your brains out for three days without talking to him first is going to hit him with the brick wall of reality. He may be overjoyed, he may call it flat out cheating. Don't be defensive, be understanding. It sounds like you are radiating logic bending NRE. Keep it under wraps while you talk to him and I wouldn't direct him to this sight for advice after that description of your weekend...at least for a while. I agree with your subject...you probably did fuck up but it doesn't have to be the end of the world. Put everything with this friend on hold until your hubby is good would be another recommendation. Make him talk as honest as he can.
Playing the Game of Life with Monopoly rules.
Monogamy might just be in my genes
Poly Events All Over