Glad to hear that the evening went well. As much as you want to think (and hope) that things can change overnight, please remember that things did not disintegrate overnight either. This WILL take some long term work by you. You have TOLD your wife you have heard her, have made specific actions (prescription, etc.) to fix the issues and have shown her some short term changes. The next step is to continue those changes and to cement them in YOUR life and SHOW her the changes are for good. While of course you do not want her to move out, I would not view her moving out as anything more than a stage she is going through. It is NOT a reflection of the work you have done the past few weeks. Her reactions will probably lag your changes by weeks if not months. I doubt she is doing it purposely/consciously but in many ways this is a test for you. WIll you give up and go back to old patterns depending on what she does over the next few weeks? If you can show that you will keep on this path even as she moves out, you will send a very strong message.
I am glad that you recognize her frustration that you did not change sooner. Do not try to argue the point with her. Keep the simple mantra whether you actually say it out loud or not - I wish I had changed sooner but I am changing NOW. While apologies are good, the key is to keep them short and sincere and to keep from appearing whiny.
As far as mysteriousness, try not to play games with this. Instead really set up dinner or drinks with friends, work outs or runs, attend lectures, go to the movies, etc. If you get caught "faking" a GAL, it will not appear strong.
By the way, what other issues are there with your marriage other than the "too little sex?"
Keep strong and stay focused!!!
Do not let what you cannot do interfere with what you can do - John Wooden
(You cannot force your wife to not move out or to come back. You can change yourself!)
But what is happiness except the simple harmony between a man and the life he leads? ~Albert Camus
