Quote: Is he really in depression? Do they waft back and forth?
Sure they do. And even though he's depressed, he may be feeling happy and grateful about the unconditional love and support you gave him this weekend.
Since he seems to like using the pages as a way to communicate, take this as a clue. My H loves it when I send him little emails or text messages - something I never used to do because I didn't want to "disturb" him at work. What I failed to understand was that Quality Time was his main love language, and sending those little messages during the day really helped him feel connected. So go ahead, send him some funny emails, short messages. Plan to go to Seattle. Make it fun - make up an imaginary identity for yourself (I was Princess Isabella at one point - my H still likes to call me Isabella ).
And yes - it's a very good sign that he is sending you those friendly messages. At the very least, he is thinking of you as a friend who was there for him last weekend.