Boys: what should i do?

okk. so me &a guy i have a thing with and earlier today he said he wanted me to come pick him up and then have us hangout all day. so i decided that i wouldn't make plans with anyone else. we kept texting about it all day, until i could get the car from my mom. finally when she comes home and i get the car i call him and he tells me that he just wants me to drive 30 minutes to his house so we can hangout for a little bit and then he's gonna go hangout with his friends (which he seemed to have left out during the time we were texting). and now since i didn't make plans with anyone else i can't find anything to do. im very mad. but should i tell him that im mad or just pretend like its nothing?