Adam, I wonder now if her agreement to your suggestion for an open relationship was to help her justify her own desires. If that's the case, I think she should be willing to talk to you more about the whole thing.

I'm really sorry that you're going through this, and I'm glad that you have therapy tomorrow. I am having a difficult time being objective - I'm not always the good person in the relationship. I'm probably not the right person to offer any advice...