Fake Bestfriends

so these girls i have been friends with for awhile and i have had problems with them in the past but we always got over them. so whenever those two get together and don't invite me they talk a lot about me and bad things and they both get mad at me and start acting weird. and none of the stuff is true when they finally tell me why they are mad. and it's hard to stop being friends with them because they post stuff about me on social media and subtweet about me and stuff. and they just talk so much crap if i get mad at them for being mean girls. i just have no clue what to do. i need help.