I'm not sure what you mean. Girls and guys in their young teen years (and older teen years) are both likely to fall in/out with other people. Both are very dramatic. While it could be confirmation bias, girls are more likely to "ignore each other", and other things that more permanently changes relationships.

If this is two bands that are interconnected that could get expensive.

You can argue that but, out of curiosity, I just sent my daughter a text.

Me: 'How long do you think you kept friendship bracelets for?'

Her reply: 'Maybe two weeks. I still have one from [redacted] somewhere.'

As I said, it surely isn't universal but she and her friends all fit that pattern. It didn't keep her from STEM, she's an MD.

> It didn't keep her from STEM, she's an MD.

That's not out of the norm; roughly half of medical students are women: https://www.aamc.org/data/facts/

The "shortage of women in STEM" mostly refers to engineering and computer science.

I'd call medical a science, but that's just me.

That's what I'm saying. It's only some of the sciences that have a shortage of women, and medical isn't really one of them. In fact one branch (nursing) has a huge oversupply of women.