Maybe he doesn't want you and D to write letters as much as he wanted to give you his address and let you know where he's living. Maybe he's trying to be more open. Maybe he was using it as an excuse to call.
Try to think positive!
In the end, it doesn't matter "why" he did this and spending your day trying to figure it out is fruitless. Just accept it for what it was and go forward enjoying your day.
