You need to sit down with him and have a talk. This isn't just about losing weight. It's also about living a long healthy quality driven life. As you age, the added weight becomes more taxing on your heart and can cause all kinds of problems. I would emphasize the importance of getting healthy and making lifestyle changes. Some spouses have problems with their significant other losing weight because they think their partner may leave them when they are skinny. If he is not willing to change or help, you need to take control and get healthy for yourself. Good luck!