My boyfriend of 3 years has recently lost a lot of weight for

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My boyfriend of 3 years has recently lost a lot of weight for unknown reasons. My type has always been chubbier men, but when I met my boyfriend (who is a thin man, even was back when we met) I still found him attractive. However, he has recently lost A LOT of weight and he has become less attractive to me. I am shallow, but not shallow enough to leave him over it. My biggest problem is touching him is physically painful. He has sharp points sticking out everywhere. Not just during sex, just hugging, or even if his elbow brushes mine, it feels like a knife. It makes me less attracted to him again.

No matter how much he eats he just loses more weight. He is still young, so I am hoping it might sort itself out with age. I just don't know what to do. How do I tell him to see a doctor about it without looking like an asshole? How do I tell him he hurts me without looking like an asshole? How the hell do I get him to gain weight again??