Is there anything that can be done?

I'm sorry you are going through the hurt and pain. I know from personal experience from both end what you are going through. I don't want to be guilty of telling you to let go of your wife of whom you been with for 20 years. That's a long time, however, I've learned one thing, you can't make a person love you if their not willing, it only push them away from you and it causes them to resent you. It is probably wise to give her some space, not divorce. If you give her space she will be able to think this through and she may come to her senses and realize how much she really love you. If that doesn't work then maybe it's not meant to be. In the mean time you try and get yourself together because you you have your life to live and you deserve to be happy. Good luck!