/cgl/ - Cosplay & EGL

I think I infected my (LDR) boyfriend with my eating disorder. After noticing he put on some unwanted weight and his metabolism was slowing, he said he wanted to get back to his old body from last year. That's fine in itself, and I even offered to help him, but he's very, very torn up about his body. He thinks he looks disgusting, no matter how much I tell him otherwise.
At first, he said he just wanted to get back to the weight he was last year (and so far, he's already lost 20lbs since the last time he weighed), but now he's saying he wants to "get really skinny". I'm worried.
It triggers me (which is actually something I sort of like, as sick as it sounds), and I'm scared that it could spiral out of control for him.
I did tell him never to eat below 1600 calories, but that was kind of useless because he finds calorie counting too much of a hassle. He just tells me he eats less than before, occasionally asking if this or that food will make him gain.

He's not as autistic as I am about documenting food and portions, so he can't really give me a clear enough image of what he's eating or how much for me to even accurately estimate his caloric intake and make sure he's okay.
At the same time, if I ask him to start doing shit like photographing his food, I could just be making potential ED behaviors worse. I don't even know if I'm just overly paranoid because of my experiences, or if I've started something I won't be able to stop. I'm just...scared.