Why is my friend always talking about how skinny she is?

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I didn’t particularly mean this in a good way. The issue is she keeps asking me questions like “do I look too skinny? Like unhealthy skinny?” And I tell her she looks great. She does. But then another time she was like “I’m trying to gain weight.” And we saw a skinny guy and she was like “omg he’s so skinny like me” and honestly it starts to make me feel bad.
Why is my friend always talking about how skinny she is?
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