It feels scary, I know. A complete leap of faith as you have no idea what is going to happen next. But you did the right thing. Your wife was prepared to continue behaving the way she has indefinitely. It would have just torn you up.
My guess is your wife will avoid talking about what you told her and will stall to see if you actually follow up on your words. If you do follow up and get a lawyer it will hit home not only with her, but also the OM. Your W will probably start putting demands on him that he might not be ready for, or even want. The sneaky fantasy will be over.
Prayers for you, IDU. Remember no matter what happens, God will lead you to a better tomorrow.
WAW Using God Me-43 W-40 M-14 S-11 S-9 D-7 EABomb 5/09 Separated 12/09