Starting to have doubts

Well it's been a week since I've heard from or seen Jeff. I have tried calling him and even e-mailed him last night. But getting no responses. I'm beginning to think that he just wasn't all that interested in me like I thought he was. Of course I'm disappointed and frustrated cus he couldn't at least call me by now to explain his reasonings for Sunday, when we were suppose to hang out. At first I thought I was being paranoid but now I'm not sure what to think. But if still don't hear from him by Sunday then all I can guess is that he's a jerk and move on. And I'm trying not to stress over all this.