Do I have the right to be mad at my boyfriend?

Okay so I'm in a serious relationship and we've been dating for 7 months as of today. Last night and all today he kept talking about us going out and doing stuff tonight, but we were texting and I asked what he was up to and he said he was at Burger King with a friend? We were going to go out to dinner or something? I haven't made any plans for tonight because I thought he and I were going to do something but now I feel like he lead me on? WTF I'm pissed! I'd rather not be at home right now when I could be with friends! Do I have the right to be mad right now or am I over reacting??