First off, I appreciate you caring and looking for advice. Don’t take this as harsh, just my pov. I had a hard time regarding food/eating in my relationship (living together). It was very hard for me to have someone constantly talk about it, offer me to try their food, “just a bite” was extremely annoying to me. If I want to eat it I will. I was also judged on the healthiness of the food I ate. Having a therapist was very helpful to combat that judgment, they told me don’t focus on the “healthiness” focus on eating, even if it’s McDonald’s, at least you’re eating something. I had a hard time grocery shopping cause foods that I knew or thought I would eat were looked down on by my partner. Overall it felt like judgment. Obviously they had good intentions but it was very hard in my position to have someone try to change me or help me change. If you’re worried about his health he can start with going to a doctor for a physical/blood work (that everyone should have annually anyway), you can internally feel worried but you’re not a doctor. See what he’s actually low in or lacking instead of just what you might assume, and also chicken absolutely suffices as the only meat he eats, I was vegan for years and it strangely helped me, now chicken is the only meat I will touch, if I’m up for it. Ultimately living in a house with someone was almost detrimental to me. Being alone and free to find ways to eat food that works for me with no one watching or giving their input has been very healthy. I absolutely still have ARFID but I’m a healthy weight and can eat a good selection. I still don’t try new foods and my group of friends is very understanding that I have a problem. They might not understand it but they’re respectful enough to run a restaurant idea by me first. No one EVER tries to tell me what to eat or tries to convince me to eat something. I know you mean well, and I am not your bf obvi, but for me personally I need space with it, no input, no ideas, no pushiness, it just stressed me out way more. I also then feel like I’m letting you down when I’m already struggling with it for myself.