Sometimes the fog does lift. Usually slowly, sometimes VERY slowly. It's rarely some big "Aha!"/epiphany moment when the clouds part and the angels shout, altho SOMETIMES that does happen.
If there is an EA, then ANY contact with the OM will re-set the withdrawal "clock" back to 0:00, which is why you either have to bust up affairs (separate the addict from the source of their addiction) or wait for them to fizzle out of their own accord.
Either way, the wayward mind and heart is, for the most part, shut off to the LBS and your attempts to meet their emotional needs, speak their love language(s), etc., will almost entirely not hit their mark when they're in this stage. They will NOTICE them, but they're not going to RESPOND to them at this point, nor will it "work."
No, it is not impossible -- lots of wayward and MLC spouses do come around and reconciliation happens. But it's a long haul, and it is with good reason why we call it "The Rollercoaster."
