Search Results: forgiving after cheating

I watched The Client List tonight, where a mother of 3 turns to prostitution after the bank begins to foreclose on their home as they're both out of work.
She keeps it a secret from her husband and family, just saying it's a general masseuse job.

How would you react if you found out your spouse did something like this? When it's been for your family, your children and keeping it together?
Would you view it the same as normal cheating, where it's for something they're missing out of the marriage? Or is it different because it's out of desperation?