Nicola has given you good advice. Take things slow. You can always pull the plug on the D at any time. He MUST prove his changes and his passion for them. Remember, ACTIONS. He will be a poor R partner for quite a while as he figures himself out.
I actually would go to a C session with him and be frank and honest to the C. State your desire to maintain a family, but you can not do it with him this way. Lay some must do's on the table and then let B and the C work on B that is why he is there. Let be know you are more than willing to listen as he discovers his challenges and successes. Hopefully, he is choosing a C that will be pro marriage and pro family. We all know what happens if he finds a C that is toxic to the R.
Glad to see you posting again, Thanks for the invites on myspace but my 1999 vintage comp. is about maxed out on memory. I'm lucky that it still works, got it from my former employer, Enron, you may have heard of them. Oh, and the snow covered MN sign melted today, it is 88!!!!