They do tend to take their wedding bands off. In their minds, they think that is telling the world that the marriage is over. He will probably leave it at home or wear it and then take it off at the vacation spot. It is really difficult to figure out what is going on with them. Their brains are so scrambled and so many misfirings along the way that it takes a long time for them to figure things out, if ever.
He is treating you like a friend, i.e., talking about safe subjects like work. Right now, he can't deal with talks about marriage or your relationship. If you are okay with safe topics, then I would listen and respond when necessary.
You are handling your situation quite well. I hope that you are doing well. This madness takes a toll on the mind, body and soul.
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.