boyfriend problem??

So, today, me and my boyfriend got invited to hang out with some friends and I really wanted to go but wasn't sure if he was going (I wanted to go with him and wouldn't have gone without him)  and he said that he most likely wasn't going and he even went home, but I found out later today that he did go and hang out but didn't tell me that he changed his mind, I wanted to go with him and now I'm upset and angry about it. He lives a lot closer to where they were hanging it gen I do but I still could have found a ride or taken the bus etc., but he DIDNT TELL ME AND IT MAKES ME SO ANGRY THAT HE IS HAVING ALL THIS FUN WITHOT ME. Especially because I might have been able to go IF HE WOULD HAVE JUST TOLD ME HE CHANGED HIS MIND.  (BTW HE DIDNT HIDE THAT HE WENT HE OPENLY SAID HE WAS WITH THEM TO ME OVER TEXT)