Is he worried about keeping his job? Is he in an industry that churns and burns (ad agency, marketing agency)? My husband is in an industry that demands absolute flexibility, and the only reason I understand is because I used to be in it too. Otherwise, I would think that he is a workaholic.
Good that you have a friend to talk to. We're a much safer bunch because we're anonymous, though.
Check out nomoremrniceguy.com and see if anything rings a bell. When I stumbled on that website, it seemed to describe my husband in many ways. Maybe there are some answers there and even more in the book. If it's not accurate, don't bother buying the book, though.