May I suggest you either post in NC or in the MLC forum. There is a lot more traffic on those two boards.
If you could post more details such as your ages, and background it helps us get more of a feel for what's going on in your sitch.
To be honest, the suddenness of this raises red flags. How well did she plan her exit from the marital home?
I'm going to tell you that most of the time you will find there is an OP involved. I do not tell you this to hurt you, but you need to be prepared for the possibility.
Hang in there Smitty. You will receive great advice and a place where we all understand.