Cheating within our Polyamorous relationship - gf and gf doing things behind bfs back

Update - I told my bf. Our gf was at work and so we had some downtime/alone time. I figured I’d tell him. He isn’t mad at all and completely understands because he knows the importance of maintaining our individual bonds as well as our collective relationship. However, i do feel the naughty secrecy of mine and my gfs side action has already dissipated. Worse than that, now she is upset with me for telling him because the vibe is gone. I didn’t know she would be so upset by this as she hasn’t really mentioned that what we were doing was that exciting for her. Any advice on how to retrieve what her and I had? Now that I’ve been honest with our bf and he understands and respects our privacy as gf and gf? Any tips are welcome.

/r/polyamory Thread