<human>: My girlfriend is finishing graduate school on the east coast, and I moved to the west coast temporarily for work (I plan to be out here for at least a year). I moved about 3 months ago, and we have been doing really well, yet I feel like the tough part is about to start. It feels like we are communicating a little differently, but honestly I cannot identify how it is different. Tonight we skyped and it lasted a lot shorter than most of our skype conversations, and it ended when a joke between us just wasn't received well (She said she could still annoy me from over 2000 miles away, and I said yes she could). We both admitted to feeling like shit after we closed out our skype session. 

Now I am feeling scared that things may start reaching a point where we will really start to face the struggle of maintaining a long distance relationship. I would love if anyone here who has been in a long distance relationship could give me a little advice on what they did to sustain the connection, or on what definitely did not help.

Give me the gist of the text in a nutshell
<bot>: Giving long distance relationship a shot, getting scared of how difficult it may become, any and all advice is more than welcome.