Quietly gather your facts. Important questions; Does the other man have a wife? If not, do you know where he works. How does the college view affairs. What kind of relationship do you have with your wife's parents?
I am not talking about driving yourself crazy here, just getting the basic facts down so that it is no longer an issue. Besides all that, there are certain things you can do with the facts, but that is for later.
Never let rule number one from my first post far from your thoughts.
Don't expect an apology. She is not sorry, and currently has little to no remorse for her actions. She, in fact, feels entitled to her actions (see my tag lines).
Good job on the finances. At least she knows that you are serious and will not go down quietly. That is a manly action. She noticed.
All the best, -NOPkins-
I will ferret out an affair at any opportunity.
-An affair is the embodiment of entitlement, fueled by resentment and lack of respect. -An infidel will remain unreachable so long as their sense of entitlement exceeds their ability to reason.