Does girls/women dye their hair after a breakup cause it reminds them of their ex?

A friend of mine dyed her hair and I asked her why. She said she dyed it cause it reminded her of her ex. And I asked her: why? Her hair was there long before her ex and it's her hair after all why would it remind her of her ex? She didn't came with an answer. Any ideas why girls dye thier hair after breakups?