wat should i do?

well, i think you should talk to him, stating that you are a little hurt that he didnt offer to take you. ask him if you can meet this friend, and maybe ask why he would prefer to bring someone else over you. try not to be too upset. remember to talk calmly in order to get a response from him.
good luck!

Ok so honestly I think you should talk to him and tell him that you're a little hurt ask him who he's taking. Give him time to talk and do not under any circumstances jump to conclusions. When he's done talking think about what he's said then make your judgement. I mean he's probably taking a friend he's might have known for a while and hasn't seen in a while or it could be a cousin or something. Hope this helps!! :)