Re: This sounds rather silly but I'm not sure what to do.
That's very strange then - either he has some social issues or is properly ill (or has lost his phone!).
When's he due back? And has he had any other recent activity on facebook or has anyone else commented on status etc which might give you some indication of what's wrong?
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Cambridge: Mocha & Bonnie (cats), Glinka & Sylvie (dogs)