girlfriend got insulted because she’s flat-chested?”

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So, my girlfriend met my cousin for the first time and made fun of her for being flat chested and also made nasty comments about people her looking like a child and not hitting puberty yet. I was stunned by these comments and really annoyed about how he can say this

My girlfriend got afterwards really upset and started crying and is now really cautious about her appearance and everything because of it.

What should I do to make her feel better?

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