Its not about you... no, no, no, its about her being selfish and path of least resistance and on and on. She doesnt want to have these unpleasant emotions, so shes just going to ignore them, and the associated baggage. It might not even be that shes enjoying the OP that much, shes just enjoying not having to feel guilty!

It also means that shes not processing these things, when her affair does fail, there will be even more fallout for her.

I guess I gave the wrong finger to the wrong man...