What do you do when your boyfriend is mad at you and you didn't do anything to him?

Well, are you sure that you didn't do anything to him? Maybe he's mad at you because he saw you flirting with another guy.. and maybe you weren't, but he sees it that way. The best thing to do is get this cleared up with him. Ask him why he seems mad at you. Maybe he really isn't, maybe your just imagining it. Who know's. The only way to find out is ASK. Communication is nessecary in any relationship!