Like previously stated .... "when there're done, there're done".
You were blindside by this but she has been working on this for a longtime.

From this point forward, think with your head and only your head. You need to not let heart/feelings make any decisions.

Get yourself legal representation ASAP and don't try to be the nice guy until it is finalized.

Its business and only business until the divorce is finalized.

If its truly meant to be, she will comeback on her own.