What else can you do? You get a lawyer and you accept that what she wants at the moment is a divorce. You should also consider that she's cheating on you dude. I know you want to save your marriage, but she needs to make strides your direction, not the other way around. You start working on making the best life possible for yourself. Do what you want as far as the house is concerned. If it's in both your names, don't move out...tell her she needs to if she wants the space. Consult a lawyer ASAP. Split up your finances. Go today and open your own bank account and put half the money in it. Put all your paycheck in your own account. Cancel joint credit cards and have the credit card company issue one to you in just your name.
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer