You will get the same advice from others but...
Do. Not. Move. Out.
I assume you own the home, yes?
If you want a divorce, and to move on with your life and find happiness (which is most definitely out there), then there is only one solution to your problem.
File for divorce.
Get the ball rolling and get it over with. I assume if you have children in college and you were married for 25 years then you are around 50 or older. There is a LOT of life to be lived and happiness ahead. Go find it.
File and tell her to move out. Or sell the house and split the assets. You seem to be wishy-washy and that alone will kill you in a divorce because divorce favors the bold and confident.
I have posted this on other threads but your indecision warrants me posting it here for you. This is my advice about making the divorce decision...
Imagine you haven’t been feeling well for a long time. For years you’ve been dragging, feeling tired, and have aches and pains that started small but have worsened over time. You have a few days every once in a while where you feel better but overall you know something isn’t right.
So you go to the doctor and he says “I can tell you exactly what’s wrong; you have cancer.”
You’re surprised but he continues, “Now, you can keep living as you have been and you’ll probably survive another 15-20 years, but today is about as good as you’ll ever feel. In the end this cancer will kill you and it won’t be pretty - it’s a really unpleasant way to die. OR… you can go through surgery and chemo which will be a year of hell - you’ll throw up every day, feel like < feces >, and your hair will fall out. But the other side of that is that your hair will come back, you’ll be cancer free, and feel happy and healthy again, in fact - you may survive another 30-40 years feeling far better than you do today.”
It’s a tough choice but it’s your choice; continue your current path, or go through some tough times to get your life back and find happiness.