I'd be bummed too.... but if he doesn't know that you have an expectation to speak with him at least a few times up front, he may be just oblivious. Is there a way for you to call him? Also did you tell him via text or FB that you'd like him to call?

I think the biggest mistake you could make would be to "test" him without him knowing there is a problem. So if you want him to call you, then be direct and let him know you're missing him and want to hear his voice and that you want to connect.

If he ignores your direct request, and doesn't have a good reason that he couldn't get in touch with you then you may have more of an issue.

Imagine what it was like for couples 120+ years ago.... I guess they'd replace calling with letters.