@Abluecollarguy,
Or you can have some fun with this.
Contact a guy on Facebook from your city. Make sure he's an attractive guy. Ask him if he would be willing to help you catch your wife cheating. Have him chat her up for a few days then see if she would be interested in an afternoon hook up.
Then you go with him with your phone camera on and confront her. Boom, evidence and certainty. Case closed.
It'll hurt but at least you'll have proof and the motivation to send her packing so you can move on.
I apologise if the way I presented this seemed heartless toward your predicament. If she is cheating, I hope you catch her.