It sounds like to me that your W is in MLC...not sure if you have heard this or researched it or not...I know my H was a lot like your W in the midst of his MLC...it was one crazy, painful, and wild ride...after nearly 6 yrs it is finally coming to an end...and I can happily state that we are now living together, no D is final (one is still pending, we go back to court in Sept), and things are finally coming together for us as a couple..I am even planning romantic getaway anniversary this year...he left just before our 25th...so maybe now that we are approaching our 28th and this has been a fairly good year thus far this would be a good time for our "25th" that we didn't get to have!
Hang in there...my H was not having second thoughts...at least not that he revealed...but now tells me that he did have them...wasn't really sure of anything during that time...
He is now being treated for depression...has gone through alcohol rehab...so things are getting back on track...something I couldn't see when I was stuck in the middle!