Let the past remain as is...the past.
You want answers that have been left unsaid, but for what?? what difference will it make to your present life?
You have moved on, to your own admission have a great life with your husband, don't rock that boat for something that happened 9 years ago.
The only way to get the satisfaction you crave against him is to really show how much you genuinly love your current life, and that your well and truly over him.