OP, I think it’s very telling that you posted this in a weight loss section, and not relationships.
He’s not treating you like this because you’ve lost weight, he’s treating you like this because this is how he treats you, and the topic of that treatment currently is your weight and diet.
I’ve lost 9st and still have another stone to go. Have been with my husband for 25 years (since I was in my late teens) and was obese (to varying degrees) for all of that time.
Two years ago, I started WLI and completely changed my lifestyle. It was a big adjustment for my husband but he’s supported me every single step of the way.
Our social life used to revolve around eating out but that stopped and he’s great when it comes to thinking up alternative things for us to do together. I love cooking and do most of our cooking at home but I no longer make creamy fattening dishes and he’s adapted. I’ve offered to make food separately so he can have things he’d prefer and, while he takes me up on that offer occasionally, he typically eats what I prepare- just bigger portions and he’ll wallop on more rice or sauces etc. for himself.
In the early days of adapting to the medication, he would hand me a (clean!) dog poo bag to vomit into if we were in the car and I got nauseous and we couldn’t pull over.
When supply of the medication was difficult to get, he helped me find chemists who had it in stock.
He’s my biggest advocate and is very proud of what I’ve done- he knows how much I hated being obese and how it held me back. He notices little things I don’t- we could be hiking and he’ll point out that my pace is much faster than his these days. Or he’ll peg my jeans onto the clothesline and comment on how small they are.
I’ve had some facial tweakments (Botox and laser treatments) to counteract the aging effect of large weightloss. My husband isn’t a fan of things like this in general, but he supports me 100% because he knows it’s my choice. We share finances so he’s technically the saying for half of them- he doesn’t even mention it.
For us, it’s not about weight. If I told my husband I wanted to learn to sail and sail to Australia, he’d be the first one looking at our savings account to see how to make it work despite the fact that he hates water and wouldn’t set foot on a boat. Similarly, he has many interests and aims that I don’t share (or understand the attraction) but I’m very happy to help and support him with those.
That’s a relationship- support and help and comfort, even when someone chooses to do something that you wouldn’t choose for them.
What your husband is doing is nasty. It’s not because of weight, it’s because of control.
I get that leaving is difficult, but would encourage you to consider therapy for yourself to understand your own feelings and reactions more to try and make your situation at lease somewhat easier. Look up the Grey Rock technique- it’s very useful for dealing with people like your husband.