If you want to lose weight and be successful, you must do it for YOU. Don't worry if your mate isn't supporting you in this journey - it is not his, it is yours. While I certainly understand why you would want their support, and really I don't understand why they wouldn't want their women to be healthy, you still must do this for yourselves.
I live in a house with a skinny partner and a skinny son!! They are supportive as they can be, but they can't eat only what I eat or they would disappear eventually! LOL!! So they often supplement the meals I cook by adding bread or potatoes to it, and have much larger portions. The good part is they are eating healthier themselves, which will only do them good.
Again, you do what you have to do for YOU!!