Ugh, sorry. So much good info and insight above.
What she did was crappy and shows a lack of empathy that is troubling.
Your reality now is that she wants you out and wants a divorce.
Divorce is a civil procedure and you need a lawyer. Yes, you can proceed without one but it would not be in your best interest. Get a good one.
One thing we don't know here is what your relative incomes are. If she is pulling down more dough, there could be a surprise for her.
Also on the house - sure it is in her name, but did you contribute to the upkeep, upgrades, repairs, taxes, etc? You might be entitled to 50% of the appreciation of the house and maybe more. A good lawyer will suss that out for you - every state is different in that regard.
DO NOT share your plans with her. Your lawyer (when you get one) is your strategist - don't tip your hand to her and her lawyer.
I don't know how long you were married but I am sorry for the hurt and the inconvenience.
I was married 7 years and kicked my useless narcissist wife out after I had enough. It's tough on the kids, and tough on me not see the kids more than 50% of the time, but otherwise it's been a lifesaver.
I am happy to have that negativity out of my life - much less stressed over here. I also managed to keep ALL of my stuff. How? She didn't get a lawyer.