A couple thoughts on spouses and SI.
One, I have never written anything down, here or anywhere else, that I didn't already share with my wife. And I vented pretty good here, it just means she heard it first.
For me, that's a relationship.
It is sharing pain, sorrow, joy -- the whole thing.
The other thought is that I did tell my wife about SI after a couple months. I had mentioned I had found a couple websites for support. I also read dozens of relationship books, to get a handle on what about our M that could have contributed to her shitty choices (it turned out that neither I nor my M can make someone decide to cheat).
My wife has never posted here, but has visited and read here and it helped her a bunch.
The WS here who were more capable of articulating their feelings helped her.
The WS who owned their choices, 100 percent helped her.
The standard sayings so many WS make (AKA the cheater's handbook stuff) really surprised her. She somehow considered her little fantasy world was unique, that her behavior was unique, that her justifications were special -- but none of it was unique or special.
She also read my posts and even though she did hear all of those things from me, to see people respond and support and understand my pain, that hit her pretty hard too.
JFO is a section that about knocked her out of her chair.
Neither of us like reading those newfound souls in shock and despair in JFO anymore.
Anyway, as one couple who made it to the other side of Hell, SI helped us both, even if only one us posted here.