syzyblue,
Who knows why they are nice. My xw says the biggest reason is because of the boys. She also says she cares for me and doesnt want to be a "B" to me. I'm sure the guilt plays a part to. I try not to read a whole lot into her actions.
I was divorced in late December.
My xw has a boyfriend.
Here's something that is really hard to grasp, Its difficult for everyone, including me, but it is paramount.
Our getting a life will make our XS take notice, they may say a couple things:
1. I can finally move on with my life without worrying about them and the things I did to them. This is a very real possibility.
2. Wow, they really have changed, I really like them, did I do the right thing? This is also a very real possibility.

Either way we are in a better place, because we are happy. Being happy with ourselves makes us attractive. We are more confident, more productive, more active, more everything. It truely is their loss if they cant or wont see it. The most important thing here is that we make ourselves happy.
I have a great life, and I want to share my life with my wife, I have so much to give her, the decision is hers. In a way I would not want to be in her shoes, becuase I know how much pain I caused her and I know how much she does not trust me. I really dont blame her for moving on.
Off my soapbox.
Hope