I agree, I wouldn't reach much into his behavior at all. "Men are From Mars, Women are From Venus" explains this phenomenon in men, some sort of "rubber band" analogy where after being with his wife a lot, a man needs to retract back and be by himself for awhile. I too am like that, and I am DEFINITELY a HD, and even when my W and I were on our frequent LM days, I did this.
Men need their "caves," their "den" into which they can retreat. Sometimes that's a physical room in your house; other times it's just a quiet place in their brain.
