My Xw did much of the same. Much of her 'awe' of my committment was out of guilt.
This is my feeling about this...she is probably feeling unworthy to some degree. She in some small (very) way knows that you have turned around and that could possibly be a good husband and father. She knows she's screwed up and there's no going back. Truth, ego or whatever reason, she cannot face the reality of her behavior. Eventually, she will try and find another man to be this again for her and she will have a clean slate and can be the 'good girl' again.
The key is getting her to realize this...that history means something. And the only way to start this is for you to make the best of this and drop the rope...
Formerly SGfan M:38 W:33 M:8 yrs T:10 yrs Bomb: Dec '08 Separated: 4/18/09 Divorce: 8/28/09 XW Affair began: April 08