TW eating disorder

So I have an eating disorder and am trying to recover. I barely eat. So when I do eat, I need to eat all of it. This happens all the time but I’ll just use tonight as an example. I went out and bought us both fast food. I got him what he asked for and I got myself a burger and small fries. He then will still take my stuff, like he’ll take fries or if it’s something he wants to eat he’ll take a huge bite out (usually on purpose make it bigger)of whatever. I try to not be petty about it because I feel dumb like not wanting to share but dude knows I struggle with eating food. He has no problem pointing out the weight I lost or get on me about how I’m not eating more when I don’t get food? Guys, please tell me if I’m being petty, but I’ve told him several times I need to eat everything I get and then he just tells me I’m not being fun or I’m being selfish. I’ll apologize if he’s right.