Hi I haven't posted to you before. With family crises I always try and treat my xh as I would an old friend with whom I am estranged. For the sake of what is past i would contact him and pass on a brief message, or ensure that he gets the message. Nothing more.
What he then does is up to him. And do not worry about the effects on him. This is you husband's journey, and all you can do is behave with dignity and self respect.