Hi DM, just read your sitch and the first signs (W staying up late) etc were exactly what happened to me and similar sitch. My W has never admitted emotional affair but I am now sure it has been happening.
Re the wedding rings W took them off ages ago. I have kept mine on. I was gutted when she took them off. It's like her saying 'I mean it, we are done' and I know what you mean re 'standing up to her'.
I chose not to ask. But then yesterday she deleted our married status off her facebook page as well, which angered me even more.