I know exactly how you feel about her faking it. In my sitch me and my XW took a two week vacation together and even made love. I thought for sure that our marriage would last a lifetime, especially after spending some quality time with her during our vacation.
Well guess what? She drops an A-Bomb on me two weeks later. Asked her why she ML to me and went on vacation with me and she said out right that she faked it because she thought it was what I wanted. WOW! It must have been traumatic for her to have spent time with me and f*** me! (Sarcasm).
Anyway, It is good that your W wants to bring up issues. I actually envy you because of this. With my XW she just rolled over one morning and said she wanted out of the marriage with zero discussion or argument etc. Been divorced since Feb and I'm still clueless as to why she left me. Never told me anything other than IDLYA. If your wife wants to talk about issues this is FANTASTIC. All her hatefullness aside, It means she may want to work things out. Why else?
Listen to MH about detachment. Some of us will never completely detach. After being with the woman 23 years how can I? But detachment is the key here. It is a healing process and it has helped me greatly. Detach Detach Detach. It's the only way your going to be able do deal with all this and keep your sanity.
Wishing you the best.
Me:48 W:55 M:22 T:23 Bomb:19Nov09 S:15Jan10 D:11Feb10 EA:Confirmed on 20Apr10 Fast track to her divorcing me