My wife sabotages my progress

At least for the overfeeding part, that's probably a cultural love language. I'm Greek-Italian, third generation on both sides, and we have to feed the people we love: if we don't, I'm pretty sure we'll explode. My advice on that front is to figure out a non-food way to say I love you and I care about you. Are you guys from a touchy culture? Maybe just a hug or a forehead kiss or even a soft touch to the elbow while saying "thanks, it was great, but I've had enough." Is it food that she cooked for you? Especially if you're usually apart, expressing the affection and care you feel for each other with physical touch, verbal words, and acts of service is really important. Tell her what you liked about the food, or how you appreciate that she remembers your faves, and she may not need to overfeed you to get the same feeling.

And get a smaller plate/bowl: filling a smaller plate tricks the brain into thinking she's feeding you a lot (with her love!) without actually making you consume a huge portion size. Plus, you can point to the number of refills you've had as proof that it was good and you're full ("This is already my second plate! I couldn't eat a third.")

And finally... does she know you're trying to lose weight? My husband tried to lose weight without telling me at one point in our marriage and I was in a panic that he was starved for food and affection, like a dying houseplant. It worked a lot better for us once he told me that he was worried about his health and I could plan healthier dinners for us both (and we got to experiment with recipes and ingredients, which was a fun adventure, even when it went horribly wrong).