HELP!!!im in a friendship trio with the other 2 people always fighting over who I like better as a BFF!?

So I have this little trio of friends and they are awesome. So what is my problem,you ask? They always fight in front of my face and are always asking me unjudgable quetions! I've know these girls for a long time, but it seems that they are still argueing over who I like more! They tell me I'm going with one or the other friend, then get mad, then five seconds later, they talk to me,"hey have you seen that new movie?" like nothing has happened. But there is no other clique for me to turn to once they have decided to break the sisterhood and I have to turn to one person. Please, if you have been through the same thing, HELP ME HELP THEM STOP!!!