Of course, you could always say "h, thank you for the heads up on the new group address. My mother and I posted a message to you on the old one a couple of days ago." That way, it doesn't look like you are questioning him about what he's done and it leaves the door open for him to make a comment.
Just a suggestion.
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.
