Rob - Let me get this straight. Your wife doesn't work, you have no kids, and she spends all her time on the internet with an OM who doesn't even know she's married????
Often, it can be a good move for the LBS to stay in the house with the WAS, in order to show their new-and-improved DB self to the WAS. But in your case, it seems to me that you are only enabling W's internet addicton.
I say, tell OM she is married, tell W she needs to move out tomorrow. Tell her family what she has been doing. Let her face the consequences. Once she is living at home and has to get a job, she'll have less time for her internet fantasy life. Of course, there is a risk she will go to OM (of course, he may be married too!) - but letting the fantasy turn into reality may be useful in the long run.
