Is it a bad thing if you can slightly see a guy's ribs?

My boyfriend is skinny, not like anorexic skinny, but when he stretched on a call, I slightly saw his ribs and it kind of scared me. Does that mean he's not eating enough or something? :(

Is it a bad thing if you can slightly see a guys ribs?
Is it a bad thing if you can slightly see a guy's ribs?
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