Csw, I wanted to jump in and say that I did not mean to imply that your sex drive caused her affair. I belatedly realized that this was how I came off, but never had another chance to get online and clarify.
Her needs were not being met and she had several choices as to what to do about it: She could have suffered quietly indefinitely, sought out another man to fill those needs, or put her whole heart and soul into fixing your R.
I believe she took the cowardly way out.
I would be a liar if I said I never fantasized about doing the same thing, in my darker moments. But it really would have been a copout wussy way to handle things, imo.
Be strong. NOP gave you some awesome advice, as usual.