I wouldn't be so forthcoming when communicating w/him. If he asks a question answer w/short, but sweet answers. If he asks if you are at work, just say no and leave it at that. At this time, you do not need to tell him everything that is going on in your life...i.e., he certainly isn't tell you about his. So, bottom line, don't share too much w/him. He needs to realize that he fired you as his wife and that things are slowly changing in the way of communicating and the relationship is definitely going to change if a divorce comes to be.
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.