My wife first threesome was terrible

Me and my wife were tempted by the idea of adding people into our bedroom. One day, One of my friends was flirty with my wife and she was concerned it might get out of hand, So we talked about it and I allowed it to continue. Over the months messages turned into sexting and plans were arranged to eventually do it. When the time came he cowarded in the bedroom. Unfriended her and flirted with her friends instead. My gf has been suffering from paranoia and confidence in herself going forward.