Sorry for your pain but like everyone here says we all have been there. Superstar is right though about moving out. My wife hit me up with the same I am over our marriage. Over the last 5 months I have learned she had an affair or left me so she could.. Matters not. But from the first I looked to protect myself and my access to my daughter.
My lawyer said don't leave the house. She can't make you. As hard as it is to hear she is the one that wants you out so she will not feel as much guilt and free up the need to hide her actions. This is a big motivator for her to enter a settlement agreement to your liking. My wife kept asking me when I would move out and I told her when we had a signed settlement. I lived with her pleasantly and really thought things were going well but you could see her drift away to this other guy, denying that he was just a friend.
Sure enough one day she left and came back with a settlement agreement that had everything I had asked for in it. Just like the lawyer said she would... following an ugly script.
I struggle everyday with why I can't let go of her. I seek out the advice of Puppy, and so many others here because I see their advice and statements play out everyday in my life. I don't offer advice on how to get your wife back just support for your pain.
But do not move out of the house, do not get close to her during any arguement, and do not talk about your relationship. You love her and are willing to give everything up to her because you care but later you will regret that!