How does a man go from seemingly a normal, upstanding, successful, and apparently happy person (in his 20-year relationship)...to getting involved in something so WEIRD with a person who is so beneath him in so many ways???
Its hard not to take that personally.
This is why ^^^^ you don't take it personally. If your XP can't see the red flags that stand out like sore thumbs about this woman, you know he's not rational right now. His fog is so thick you could cut it with a knife. I pray he wakes up in time or she'll take him for everything she can get.
I believe she's so private because she has a lot of things to hide...
Just continue to step back and detach. Keep doing what you're doing. Love him from a distance and offer no help of any kind. Your XP is in for a rude awakening at some point.
Keep DBing, I believe it will come in very handy in the future.
I think you're handling things admirably. Your strength and confidence will serve you well.