Why is my best guy friend ignoring me?

He's one of my best friends. We hang out every weekend. Last weekend we had an amazing time and went to a music concert, and actually went to another one the next night. We don't argue. We usually talk everyday. But, ever since the day after our amazing weekend, he has not answered my texts or Facebook messages. It takes 2 seconds to respond to a text, so I'm not sure why he's ignoring them. Last I knew, we had a great time at the concert. I've done nothing wrong. Why do you think he would just stop talking to me for a whole week? And how do I get him to start communicating again?! Please help!
Why is my best guy friend ignoring me?
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