Well, although I’m not surprised he didn’t respond to that list, my reasoning is a little different - you made that list because he was already out of the marriage but you didn’t know it, so you were looking for solutions without knowing he was having an affair. Gaslighting will do that to you.
As for his frugality efforts - followed by a $50,000 car loan! Obviously the frugality part wasn’t something he could stick to. Doesn’t mean, though, that a frugal approach FOR YOURSELF wouldn’t be a good idea - check out the Mr Money Mustache blog and message boards for information and inspiration.