If you visit Phil McGraw's website he makes a point that over 99% of affair couples trying to make a long term commitment FAIL

The divorce rate for a healthy start is 50%... If the couple is an affair couple who violated and abaondoned a LBS the divorce rate for them is 99%...

It won't last... they never do.

Penny Tupy quotes 90+% on her website as well... So I think you can be conifdent that any marriage that may happen with the affair couple won't last long term