Why younger girls want relationship so bad?

I recently got this feeling. I have a friend she is 15 and she was super into one guy for a long time. They were seeing each other for a while but then she ended it. Now she is super into another guy and they are seeing each other. I dont know to me it seems a bit like she is in need to be with someone. Not saying it is something wrong but just a bit weird maybe to me

Why younger girls want relationship so bad?
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