Difficult one...but good that he acknowledges he needs to do something! The best thing you can do is encourage and support him, and try not to appear "naggy"...which is difficult I know. To achieve good control, he needs to test his BG and then do something with teh results. His clinic should be able to support him with this. It took a serious health scare to make me improve my efforst at diabets control..and even when I try my best, I still am nowhere near perfect..which can be very disheartening at times. My hubby always helps though by congratulating me on teh positives. He also takes the attitude that my diabetes is our issue, not just mine, which somehow helps. Of course, at teh end of teh day, us diabetecs have to do teh work ourselves, but it is easy to sink in to the "bad stuff is inevitable" frame of mind and give up trying.
Of course, introducing him to this site would help....no one preaches, and we understand how difficult it can be. he is not alone!