I am not sure what you are saying? Are you advising me to look to get out of the relationship? Or keep my eyes open for any sign of slipping on my WS's part?

No I am not advising you to get out of your relationship.
What I am suggesting is that you realize the full impact of the fact that your wife was not having a torrid affair but a real long term relationship emotionally and physically. And deal with that now why you are in C. So it does not come back to haunt you later. Ask the questions you need to ask get the information you need to understand the whys and hows. Things you brush under the rug now as not as important as making things better will have no chance of resurfacing when that rug starts shifting if you deal with it now. The things you think you can go without knowing are usually the ones that internernally tear you apart.
Your emotional response to BF thread about something you thought you were okay with. Something as simple as a personality type. Is what I am trying to convey the importance of truely dealing with. Not sweeping under the rug.

I believe she is truly sorry

I am going to ask you another loaded question.
Why do you believe this?

I am not pushing you to be mad at your wife. Though it may seem as if I am. I have no reason to want you to be mad at your wife. But you have a lot of pent in anger and you need to let it out and face it so you can deal with it.
And I am trying to push you to use this board in a constructive mannor to do just that.
Some times just writting what you feel is a great tool. Better then any verbal outlet you will ever find.