Most affairs begin fizzling long before 6 months, without exposure. That's been my own experience (my wife has had affairs, and there have been countless friends and relatives from whom I've derived good information).
About the dozenth time they get together, the blissful couple actually starts talking about things other than sex or how beautiful the other's eyes are, etc. Then differences come into play, and eventually it's just another relationship that takes, like, work.
Because cheaters are so dishonest and vapid, they're hard wired to screw things up at this point. There is, naturally, zero trust between the members of the affair, and they take all their other loathsome character flaws into the new relationship with them.
You know all those little things about your own wife that drove you bonkers? Vice versa? They'll be driving your wife and her new friend nuts shortly, if they aren't already.
Peace man. I'll be back in a few (hours) to see if you've added me on fb.
M:40 W:40 2 teenagers ILYBNILWY: 09 January 2010 soon to be walking away my situation