Our situations sound very similar and it certainly stinks, doesn't it? I am still torn over what course of action to take and still mulling the options. My W also says she's done with being married (to me) as well so we could stop pretending and I could move back in which would probably hasten any D proceedings - which for now we've decided to wait on. I'm still waiting to receive my copy of DB (Amazon says it has shippd) so have not started anything yet. I don't want throw in the towel too soon, even if W right now is saying she's done, so am inclined to keep peace for now and stay in the aptment down the street.
What is your D telling you? How close are you (your only child right?) I'll be honest, since I travel a lot w/my job my S is used to me being the one away. Also boys are often closer w/their mothers and my S is. However, Ds are often closer w/their fathers. Is D asking when you are coming back? telling you she misses you tucking her in at night etc? Also, do u think ur W is bad-mouthing u? Mine is not and that is our agreed code of conduct. If ur's is then it makes it harder.
At the moment my W is not committed to try to save our M - but based on what I read on this website and talking w/others, maybe she will change. However, am I fooling myself and how long should I remain in this limbo situation? I imagine u r feeling similar.