It's normal behavior for someone in crisis. When the depression lifts a bit, they begin to act like normal people again. When the depression returns, back to being sullen an withdrawn.
He will continue to test you for a long time. Why? To see if you've changed and if the changes are permanent. Continue doing what you are doing and just let things slowly glide along.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
