Yes, it's possible to get back to that - and even better than that.
And while I would have thought, before my H's infidelity, that that was an absolute I wouldn't tolerate - now I know that things aren't quite so black and white, and that throwing out a mostly good marriage over an episode is not necessarily a good bargain.

Think about this - IF you divorce and start a new R with someone else, what guarantee do you have that THAT guy will always be faithful? Seems to me you have a much better chance with IC, who immediately saw that it was wrong and took steps to correct it, than with some new guy who may have worse problems. I think going forward, IC actually looks like a better bet to be faithful from here on out than most guys.

Ellie