Late diagnosed wife

I (NT) have been married to my wife for nearly 38 years, trying to encourage and work with her throughout that time. I am a lecturer and architect, and my wife does some part-time counselling. As I reflect back over the years I see it has been very hard for both of us, being so different. We have raised two children. Though we have been generally happy I have always longed for deeper and richer communication between us - basically a close friendship. But this has not been possible, and we largely do our own thing.

She was diagnosed with autism three years ago, after which she dived into researching the condition. It has brought her a measure of peace, and she has adapted her lifestyle to better suit herself - more rests, less social engagement. With the diagnosis my hope for enriching in our relationship has gone. In a sense nothing has changed from before the diagnosis, but somehow my enthusiasm for us has gone. I am kind and patient, but I have withdrawn somehow.  

Any advice, or groups I could join to explore further?