I have some thought and I'm not sure it will help but I'll try.
When you two were working different shifts you were not aviable to him, that can be a big turn off. He could have felt like he was very low on the priority scale and may have been resentfull. My wife was working a way too much for about year like 100-110 hours week. We fought about it noone told her to work it and she said "it needs too be done". Asked her too cut back and work only 6 days and no more than 12 hours she would not. This proved told me that her job was more important than our M. I would guess your H had some of those type of feelings. I bet he feels more "conected" now that your home together more. It could be he question why he was married when your not around. Just my take on that.
The privacy thing maybe not hide anything just so he can be alone with his thoughts. I have bit of the same issue with my wife when I'm in the bathroom. I'm sorry sometimes I really don't want to hold a conversation while siting on the pot. It also may not just be "privacy" issue maybe he wants a little quiet time were he he read or think with no interuptions and not feel he needs to answer for minute what he's doing and what he thinking about. Just my thoughts maybe it will help you.
