I don't have any words of wisdom on how you should approach your husband with this. You will have to talk with him though. He is being so unfair, even if he does not realize it. Not supporting your diet is one thing but to tell you you are fat is quite another.
My husband has a large belly and he sabotages my own efforts at trying to help him eat well. He eats everything I pack in for him for the day but also visits a junk food joint at least twice a day. He doesn't do it on purpose. He loves his food and has such a high self esteem that his belly does not bother him. So it really does not matter to him one way or another.
I generally don't eat dinner, also being overweight, and am very fortunate that he has come to accept when I don't eat his cooking (he too can cook very well). But I hate it when he brings home take-aways or pizza or anything "forbidden". I am hard pressed to resist.

I hope you are able to sort it out with your husband. And I commend your efforts at trying to lose weight.