OP, I got some advice.
Google Walk away wife and wrap your head around all that. Hire a PI today so you will know If she is up to something and don't ask her any questions as the more you ask the more she will hide it.
in my State a professional PI pictures will prevent you paying alimony.
Rule #1 Dont ask her any questions.
She is now your enemie, don't tell her anything or give away your strategy no matter if you want her back or not.
It's now going to take time, a divorce or her coming back is gonna take lots of time. What you do next will determine your future, Very good chance she has plan B lined up. find out but never ask her. If she ever thinks you are on to her you may never find out. Become a ghost....