Maybe just show him your concern and that you are asking because you're his wife and love him very much. And that you are there when he is ready to talk. Keep it short and simple. Just show that you understand he may be going through something, but that you are there for support.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.