Please read your post #2224660 and look for the signs of depression you say above that you have not seen.
And asking him is not likely to get the answers, nor will reading books. Getting the answers will require you to actually communicate and engage with your H (remember, eyes, ears and mouth) and his environmental influence.
Also, your H is trying to show his love in his LL, regardless of whether it's called "quality time" or "quantity time".
How would you or did you show your H that you loved him?