@outdoorsman329,
I think the thing is - you are asking for help in starting a conversation with your wife to find out what is going on. But, all that can be given on a forum are suggestions...emotive conversation takes twists & turns, and how to proceed is usually very dependant on what is just said, tonalities included.
As the above requires a certain amount of skill - if you don't have that, then there are two options. Counselling is one.
The other, would be to talk about your feelings on this topic.
Eg. #### I can see you feel betrayed / hurt (or similar), and I can see now ****. I didn't consider it because <eg. it didnt even cross my mind to cheat with her, I just needed help with my resume, and she has helped a lot of my friends>
I would like <hopes & dreams of the type of marriage you want / where you want your relationship to go.>
Again, I'm sorry I didn't consider how you would view my talking with her. It won't happen again.
Etc
You aren't going to lose anything at all by being open about such things, and it may gain you much.
There is of course, no guarantee on that, as it depends on your wife's motivations, past history, trust etc. In any event, after the above conversation, it's a matter of waiting for a response from her (you shouldn't need to ask for a response).