What did I do wrong?

I am thirteen (oh what a joyous age to be) But we just rented our house out and I am feeling a bit out of place in the house we are staying at. And all my friends have suddenly started ignoring me and treating me like i don't belong with them because i had an argument with someone and we made up but every single one of them said they didn't like the person i had the argument with yet when i made up they treat me like crap and only talk to her. Now I feel really upset and my "best friend" who we both decided were each others only bestfriend said "oh im glad you made up cause i was having a hard time choosing between my best friends" I feel so sad. and this has been going on for about 2 weeks and i feel like i am being shunned and then they lie to me atm aswell.