I don't want to hijack your posts but just reading Sandi's post here and I have seen my W get most over my behaviour the last 2 months. The only place she knows I go to is the gym, but everything else I have kept the details away.
For example, this Saturday I have plans to meet another family with my kids, I have only told her that I will be out with them and I don't know for how long. I am also then heading out on Saturday evening, she wanted to give me a lift to where I was going... I said no, and that I'll be fine. In both occasions, I am going out with people she doesn't know, yes she will get details from the kids but that is after she misses out on it.

I feel my W is trying to play mind games with me, it is nice to return the favour and I don't mean in a nasty way though. I have had smiles to myself when the questions come.