Does my friend have the right to be angry at me?

well my friend who is like a brother to me invited me to Cosmic bowling an an he said he was bringing his GF, friend, an friends Ex but instead of his friends Ex his Ex came so his Gf was pissed because his ex has been trying to come back in his life, (he use to really like her alot like love her) I didnt want to get involved so I was mutual an tried to be nice to everyone, usual in Cosmic Bowling me an my friend mess around and dance, the cupid shuffle came on an I started to dance all of a sudden his Ex starts to dance infront of me... I keep trying to give her the hint that I was not going to flirt with her but she keeped flirting with me, after that the next day I called my friend but he didnt answer its been four days since that day an he still isnt picking up so I am sure he is mad but I dont think that is fair??? what should I DO??