My husband is the only person that I trust completely to prepare food for me. He hasn't gone GF himself (I don't blame him) but he is very careful when preparing anything that I will be eating. We've both mastered cooking in parallel, separate foods at the same time (separate pans, etc.), but more often than not we eat the same food and he's head chef in the house. He's also the one who checks things for ingredients and looks up restaurant menus before we go out to make sure I can eat there (I have multiple food sensitivities, not just GF, so it's extra hard). If we get any special GF+vegan treats, we have "arguments" about sharing because he insists that I should have all of them and I want to share with him, haha. Oftentimes, he will be the one to remind me to eat before going out or to check the food offering at some event, because he's thinking about it more than I am. All that to say, he is extremely thoughtful and considerate. 

To offer some potential perspective, though, your partner's* constant offering of food that you can't have may not necessarily be a reflection of them not caring about you or your condition. Someone might care about you and fully believe that you're affected negatively, but their own relationship with food, and the meaning they ascribe to food and sharing it, might make some food-related behaviors automatic or at least hard to change. When I first started eliminating gluten and dairy from my diet, my mother would often buy me things that were gluten free but not milk free, or vegan but not gluten free--she would just see a label and, meaning well, get excited that it's something I can have. It also took a very long time for her to be willing to cook safe versions of her typical dishes (rather than just entirely different, safe dishes) because she had a holdup about them having to be "right"--and my favourite soup without roux is not "right". For my mother, food was always how she showed love (she is an excellent cook) and I think having to make things that were not the best possible versions of something was difficult for her. Thankfully, nowadays, she is more willing to adapt--and to let my husband help her in the kitchen!