I think I've only seen a few women mention it over the years here here but I've heard from other places that divorce is common after one person in the relationship loses weight and the other does not (or the other doesn't adapt). I'm not saying you are heading for divorce but what I am saying is that one person in the relationship changes and the other can not adapt to that change. It is definitely a time for open dialogue. Often the other person in the relationship thinks the change is for some other reason such as another person in your life and they become jealous or possessive.
I think you just have to talk to your husband and let him know that you are happy with the new you. And yes ask for his concerns and let him know that you would like him to be part of your support team, not an adversary in your weight loss and maintenance.
You can't out-exercise poor eating habits.