Looking around when we're out

So this guy I've been dating for a few months says he is very guarded and hasn't opened up much to me. He avoids eye contact alot and when we're out to dinner, he's always looking around. Could this just be a nervous thing he does?? But then he brings me to watch his friends band play and has his arm around me and pulling me into him the entire time. I get alot of mixed signals from him.