As Mr Clarkson said, time to man up.
Don’t move out, if she wants to end the marriage, then she can face the consequences of her actions. Why should you fund her new lifestyle.
For all the bleeding heart advice here, you’ll be the one who’s shafted left, right and centre.
If she wants to leave, let her, just don’t make it easy. Why should you. She’s dropped the bombshell, she can clean up the mess.
A friend had the same experience years ago, she came back later as the grass isn’t always greener. They had two homes, one in France and one here. She got the house in France and he kept the family home.
When she came back, she sold the French place and “bought back” into the family home. He wasn’t going to go through the same thing a second time.
Deccisions you make now will have long term effects on your future. Take care.