The psycho girl in my year..

There is this absolute crazy bitch in my year at school. (Year 12.) She's 18 and just broke up with her 6th serious boyfriend. She's just put up snapchat stories of her BURNING HIS CLOTHES! I'm friends with her ex and I know he asked for them back, but she said no and is burning his $90 jacket, $60 vans, photos, a pillow, letters, a cap and a few other things.
I totally disagree with what she's doing and the ex is telling her no and so are his mates. Do you think I should step in nicely girl-to-gel and say something about stopping? Yes or no?

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