Should I Apoligize To My Best Friend Or?

me and my old best friend were best friends for 2 years then on her birthday she brings her boyfriend along which is my ex and we didnt like eachother for like a month b.c she started dating him a month after me & him broke up and i still liked him. well on her birthday she said it was going to be a girls thing and no guys but it was me & my boyfriend's 6 month anniversary the same day and i told him i knew her first and she said no guys so i went to her thing but i show up and she has her boyfriend he so does my other friend and she was like i forgot to tell u you could bring him but he works and has to tell his boss a week in advance for a day off. i got pissed at her yelled at her and she said she dont wanna be friends no more b.c i have my boyfriend and he dont like you and i dont need you. i mean what should i do? i know i should'nt of yelled but geez thats a little harsh?