1. We have no data to suggest that a random new mate is less likley to cheat than a current mate who has worked through the rebuilding process. 2. The only way to know if a relationship CAN be repaired is to explore that rebuilding process.
Granted, in some extreme cases of multiple affairs, violence, etc, I can certainly see why some may just cut their losses and opt not to explore this venue.
But in OIN's case, there was no PA that we know of, and he EA was brief and not that involved.. though OIN is still monioring the situation.
OIN's situation is quite mild compared to some other posters on this forum.