I'm fucking pissed! do I have the right to be?

My boyfriend decided to go to motherfucking LASVEGAS with his friend for his friends brothers wedding. I from the begaining did not feel good with the idea and I expressed my concerns to him obviously. He kept telling me there's nothing to worry about and that he's still going! Okay so I decided I wanted to go to a concert which happens to be during the same time he's gone. He literally went ballistic and decided that I could not go and even though it seems bias he doesn't care I still can't go!? Like wtf