Maybe you will be able to stick to it this time if you reassess what your priorities and goals are.
I am on my second round of WW. This time I said to myself that I am not just doing it to lose weight. I am doing it for health reasons and to take care of myself. My goal is not to just lose weight but to become a lifetime member. I have stuck to it for a year now and I am only 5lbs from my goal weight in order to acheive lifetime membership
How I got my DH on board was to tell him that we need a lifestyle change not a diet and that I needed his help with this in order to stick to it. This meant me cooking healthier meals, keeping good healthy snacks in the house and him not enabling me to eat junk food. He has slowly come around and now chips and cheese puffs are not a regular item on our grocery list
Maybe if you do things like write up menus, take before pictures set yourself up a binder to hold your WW materials, set yourself up an exercise schedule etc. It will show him that you are serious about this and that you have a plan of action. The only thing is that you will have to make the commitment to yourself and follow through with it.