Sara: My wife & I spend hundred of dollars every month on her affair (excess cell minutes, hotels, rental cars, flights, etc). Because we are married, there is no separate money. It's all OURS. Therefore, I am helping her financially to keep this affair alive.
I should add that she recently got a new credit card account. In the event that we do end up splitting, I will see to it that the balance on this account will be 100% her responsibility (she is not aware that I know about it). You can bet on that.