anex best friend is someone that used to your best friend. and that person used to be your ride or die, a person to talk to.
then they did something to hurt you, and that's how they became an ex best friend.
you wish you still had them through your hard time like they had you through there hard times
person 1 :what happen?
me: they hurt me
person 2: im sorry
me: its fine shes just an ex best friend