As hard as this is to understand.. whether she is or is not have a EA/PA is somewhat irrelevant.. even if it has some "gay" tendencies. The affair is just a.. "outcome" of the situation people find themselves in.
The question becomes.. is a EA/PA a deal breaker for you. If its not.. then you will have to "hold your tongue".. and deal with it once things change. You can tell the OP that it is unacceptable.. but you kinda need to leave it at that. The more you focus on it and point it out.. the quicker they may move toward that OP.
If it is a deal breaker.. then get your stuff together.. and file for the D.
It sounds simple.. but in RL it is not.
Things can happen quickly.. depends on the state you were married in.. and if kids are involved.
It also depends on how.. "set" the OP is on getting things moving. With enough money.. you can make anything "happen".
Don't focus on what may be taking place.. focus on what you can control.. and change. LS can't change if his wife is having a EA/PA. LS can't change the pace of things.. to a point. LS can't change that his wife wont listen. LS can't change that his family is going to suffer some.
LS can walk thru this with his head held high.. and make decisions that have long term "good" effects. LS can do his best to transition to a "new" life for his family.. down the road.. that will pay off.
We get so caught up in what is here and now.. and we loose sight of what will be.
I love the tone of his (LS) posting.. if I am right.. he is going to come thru this with flying colors. It shows me he is thinking.. about the things he can effect a change in.
Relax Eat Think Act normal React.. Smartly. Do something different. Emulate. Do Work.