If you are the type of person that recognizes birthdays and other special events, then I don't see any problem w/it, but do it w/o expecting him to acknowledge your greetings. Keep the greetings very simple and brief, i.e., just as you would send a long distance friend.
Don't assume anything when it comes to your h. He may be one of those individuals that can't actually cut the apron string and continue to pop in periodically, even after you remove him from your insurance. Anything is possible w/a crisis person.
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.