I can be "friendly," and I am concerned for my wife. She's feeling a lot of stress over our R, and our daughters are acting up because of the tension. This adds to my wife's guilt and stress. Her normal inclination is to suck it up, so abandoning me is hard on her; she feels like a failure.
But, and a big but. She knows she wants out, but is scared of being alone, of being responsible for coparenting, for a million things.
I will continue to be her friend, for the simple fact that she's helping to raise my two daughters. Being mean, or petty, or vindictive will only hurt my daughters.
The three things she described as attractive in me when we first met were that I gave her lots of attention, that I was smart, and that I was kind. If I'm ever going to win her back, it'll be because of those traits.
I can't give her the same attention, she simultaneously wants it from me, but also doesn't. She doesn't trust anyone anymore, doesn't believe in romance...