the way I see it, you have a tremendous advantage over many of the DBers on this site. One, it is very early in the game and you have already found this forum. Two, your W does not know for sure that you are on to her daytime activities. Three, your W is not (yet) threatening divorce. Four, your W has very articulately stated her problem - boredom and being in a rut. Five, she does not have a specific someone to draw her away from you. As others have probably said before me: You have a golden opportunity to turn this around. Most importantly, you have the gift of TIME. Read the books, and the important threads, and learn from others how to avoid the mistakes that we made. You need to start working on yourself immediately; not to win your wife back, but because you should be working on yourself regardless. Things to learn include your Ws love language, how to be an empathic listener, how to transform yourself into the husband and lover that a woman would be insane to leave. Once you achieve this level, you will not be dominated by the fear of her leaving. Right now, it may be easier to focus on her transgressions, but by trying to control her or showing disdain for her, you will drive her further into that world. guaranteed.
Is your marriage worth trying to save? ABSOLUTELY YES. I am D and now happily remarried. I don't have any regrets about it, BUT... my children will experience repercussions forever. Furthermore, I am still very entangled with my xW. Divorce does not sever the relationship, but creates a new distrusful and unpleasant relationship. You do not cut off your arm because of a hangnail, but you do cut it off if it is gangrenous and the toxins in the arm will kill you. Similarly, you do not get a D unless the M is going to kill you - for instance and abusive or violent spouse. I do not think you are in this situation and I do not think your M is killing you.
You will have to take a long hard look at yourself, accept your your role in this, take a deep breath, play your cards close to your chest, and begin doing the work.
