That's the thing with depression--their minds and emotions are all over the place, going up, going down, and until they're ready to deal with the source of the depression, they feel they have no control over their thoughts and emotions. Don't take it personally that he doesn't want contact right now; after all, what he needs most is that time to be forced to deal with his own funk, not even the distraction of his family (wrong though it seems).
In some ways you might consider this time a dress rehearsal for when he does enter the Withdrawal stage and pulls even further from you--what helps you to get through such times? What coping mechanisms work best for you? Can you put on detachment like protective armour when you require it?
Good for you on booking the caravan holiday and surviving your first anniversary while separated. You are sounding stronger all the time!
