I've got this book - and it's describing my H to a tee.
In respect of the cars, I believe it's the fact that he will lose the visible status associated with driving an expensive luxurious car (and end up having to drive a basic 2nd- hander)
together with the fact that his family (i.e., the kids and me) will also have to be seen around town either walking, or in a cheap 2nd-hand car, that's making him flip out.
Throw in the fact that we'll probably lose the house if he can't continue to contribute to the mortgage repayments due to having to find $10K to break the car lease, and you have the perfect storm.
The public nature of his failure to be able to provide for his family is simply too much for him.
Having recognised this, and read the book, still not sure how to deal with it adequately....