I'm a confrontational person and when someone does something I don't like I let them know. I'm between trying to figure out what's wrong, cursing this guy for wasting my time or just ignoring him and blocking him from contacting me period.
But I won't.
Most Helpful Guy
Most Helpful Girl
Unless it was an emergency, there's no reason he couldn't send a text saying he couldn't make it and even that he'd explain later. But, I'd ask first and see what his explanation was. If it was understandable, try rescheduling. If not, move on.