I wish there had been a thread like this when I joined the board in 2005.
I bought into the oft-quoted "80% of MLCers return". It gave me a fase sense of security that H would eventually come home.
The MC I was seeing at that time told me that H's 8-month affair was on its last legs based on the 25 year age difference between them. She also said that affairs rarely last beyond 36 months.
So I waited it out. And waited and waited. After almost 2 years, I was sick of the humiliation and filed for D. It was granted last Fall.
And the affair that should have died of natural causes is still chugging along. It has been going on four years now.
H has finally quit telling me how unhappy he is, how he wants to "unload" the OW, and how we are not done yet. Probably the only honest thing he has admitted is he is afraid to be alone. I never gave him any guarantees that I would take him back, and he knows that the OW (a fatal attraction) will never leave.