The worst thing that can happen in a long distance relationship is when you stop receiving texts without a warning.  You immediately notice but try to play it off.  You start telling yourself excuses like "maybe they're busy" or "they're just having a bad day".  
But that day turns into a week;
one week turns into two;
two turns into three...

You finally ask them what's going on.  You see your phone go off but you're too scared to read their reply. Six minutes later, you finally read it:
"I'm trying to use my phone less"
Normally, you wouldn't think too much of it.
But then you realize
The only way you can communicate is by phone...