Wow .. I'm so so sorry, hon. I remember reading posts prior where things were going amazingly well. In my opinion, she should have NO REASON to be seeing Bill alone ... the only purpose he served was to help the two of you explore different realms of lovemaking. It's a team effort, and she's not including you. Time to sit down and have a heart-to-heart with her. Tell her exactly how you feel, what your thoughts are, and see how she responds. She SHOULD want to change so as not to hurt you. You deserve better, honestly.