Girls, Is 5 feet 8 inches and 145 pounds for boys?

My boyfriend has a nice body but lost weight recently and I don't know If he’s underweight now. He thinks he won’t be attractive to girls anymore.

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Update lately since the weather has been nice I see a lot of boys wearing just trunks and no shirts. Not sure if he should do a selfie since not every girl likes pics like that.
Girls, Is 5 feet 8 inches and 145 pounds for boys?
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