Only two weeks until he's gone for 3 months

My sweetheart is leaving for a training course in two weeks and won't be back until it's nearly August. We've been apart before due to deployment, training and other stuff like that, but it never seems to get easy. This time I'm feeling an especially large raincloud because when he gets back, he's moving to another state and it will be several MORE months before I can follow.

We use Skype and email daily when he's gone to keep in touch, but there's a small chance that the lodging he'll be in might not have internet in his room. Needless to say we'll both be extremely unhappy if that is the case!

Do you have any tips for dealing with long-distance periods in relationships?