I don’t really agree with you, but that’s you’re opinion!
I think he seems to go along with what Holly wants to do because she can’t sit still and not exercise. He naturally probably has more stamina and he eats a lot more than Holly. She will only eat rye bread and sweet potatoes (carb wise) whereas he seems to eat whatever he feels like eating.
Angelo may well be aware of Holly’s past, but it doesn’t mean that he has to become her carer and stop running himself or change his diet to try to prevent her ED behaviours that have never gone away.
Holly was determined to start running again, but as it has coincided with Angelo coming onto the scene he is being labelled as both responsible for her excessive exercise and supposedly his own. I don’t know enough about him or see enough of his daily routine to label him as an exercise addict with an eating disorder.
Angelo is not suddenly an extension of Holly because they are in a relationship and should be free to exercise if he wants to without being accused of trying to trigger her. Holly is an adult and is responsible for herself. If Angelo wasn’t around and Holly was running daily which I can guarantee that she would do - who would you blame other than Holly herself?