"Sorry, I don't think we are on the same page regarding marriage, we don't see each other so much anymore, I'm terribly lonely and feel like we've married young. I would suggest a period of seperation, and we'll see what we go from there"

The key to any good marriage is communication. Instead of communicating her feelings... She took the easy way out and cheated, while he was way on bootcamp. She might have married young, and might have been lonely. But she did take her husband for granted, and cheated on him... She also hid the fact from him, for 10 years and took away the choice he had to make an informed decision for all these years. Nothing about her, in this arc of a story, makes her seem like a good person...