My W is at a similar point. 9 months in here. 2-3 months of full understanding on my part. My W is also in crisis, but I'm thinking she is MLC, WAS and/or perimenopause all combined. MIL has told me her 40s were bad - perimenopause through the roof. Hated husband for no good reason. She thinks could be the same with her D.
Also no affair going on, but there may be some IA's with all the internet use. One can never be 100 percent but I'm pretty sure it's not reciprocated - she leaves her phone/tablet out in the open. I do not look at all.
Saw some positive signs after about 5 weeks of DBing last few weeks only to plunge back into the MLC trough this weekend. I'm still at touch and go. She still wants S, but hasnt made a move past IHS yet. My increase on space and detachment seems to have put at least a temp pause on that.
You're in a great place. These people know a lot. The resources are also amazing reads, esp on MLC. I'm sorry you're here, but be glad you are here!