My guess is that a major change needs to happen with your wife before she really wants to truly return to the marriage. A change of AmyC proportions. I think if you hang tough, and lovingly make her feel the consequences of her actions, if she REALLY wants to return, she'll make the necessary changes.
I want to point out that I did not change by choice, necessity or because of economic hardship.
If that was all 'change' required, my MLC wouldn't have continued past a year and it wouldn't have taken a second 15 month separation (after one that lasted 8 months) to really wake me up.
But it was not those separations or the hardships I endured because of them that changed me.
Life, circumstances, some major reality checks and a few very dramatic events all worked together and I was changed.
I will post more about this later but I don't want any misconceptions that all Frank's wife has to do is decide to change.