Keep them or leave them?

Best Friends are meant to last forever.Right? Me and my best friend have been bffs since we were in 2nd grade. Usually when she starts her period she gets super mad at me for no reason. This time we didn't make up. I'm doubting that it was just her period this time because shes moved on and started gossiping about me already.I dont even think i want her back but everyone says we were meant to be best friends and i know i didnt do anything wrong.