There could be several reasons he doesnt ask about your private life. 1) because its private. 2) he is more detached than you at this time 3) he "assumes" he knows whats going on 4) he just flat doesnt care 5) He is afraid of what he might find.
I'm pretty sure in my case, my H just flat doesn't care. Not that I'm off doing piles of mysterious things, but on the occasions I do, he doesn't ask any questions whatsoever. He's been this way since BD, not asking about my day, about anything I attend, about friends, even about kid events that I attend but he doesn't. Not. One. Question.