Why is FaceTime not working?

I have an iPhone 4 and my boyfriend has an iPhone 5.
We've just attempted to FaceTime and for some reason a notification comes up on my pone telling me that he is not available for FaceTime and I can't understand why.
We both have Wi-Fi so it's nothing to do with the 3G connection & we're only 6/7 miles away so I wouldn't think it would be the distance.
We tried to FaceTime when he first got his iPhone to see if it worked and it did although we were in the same room at the time.
I have never had any trouble on FaceTime before.
Anyone know why this is or have a solution to the problem?
5 stars if you do.

It could be he might not truly be available. Sorry couldn't be more helpful

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