Why aren't Bella Thorne and Pia Mia friends?

[Molly]

They're not friends. Wish people wouldn't answer when they don't even know what happened lol they had a huge falling out when Pia and Bella's brother broke up. Pia started a trend calling Bella and her family the #thornebullies it was pretty nasty. Pia is a beautiful, talented girl but she's a pretty rotten person. She uses other people for fame then dumps them when someone better comes along.

She was friends with Stella Hudgens for years, then she dumped her flat when she started hanging out with Remy and Bella (because Remy didn't like Stella).
Then Bella got tired of her crap and Pia moved on to Kylie and went crawling back to Stella.
Now Bella is friends with Zendaya again (Pia kind of put a rift in their friendship when Pia and Bella were were friends) and Pia is friends with Kylie and also with Stella.