I'm gonna offer up a big fat-ass w3rd to what Stazi said.
Plain and simple: she doesn't deserve you, T-Bone. Take your daughter and be happy. If another woman comes along down the road to be the woman you thought your wife was, then so be it, and be happy.
Until that happens, go through the proceedings (custody, divorce, whatever) with a calm and level head. When those are over, you can be free to be yourself again.
Some day, whether it's weeks or months or years from now, you'll look back on this and think of how good you have it, and how character- and life-building this whole "episode" was.
Peace be still. You're in my thoughts and prayers.
