would you be mad/annoyed?

My boyfriend planned on going to schoolies at the end of the year (I'm a year younger) and then he said nah he's not going because he has a girlfriend and stuff. But now behind my back he has booked flights and is planning on going but is denying it to me. He thinks I think he isn't going. He promised me no more lies. He promised me he wouldn't turn around last minute and tell me he's going. But that's exactly what he has decided to do... ? 
Am I right to be a little annoyed that he's telling me he isn't going when he actually is and has paid for everything.