Almost everyone feels like this at points. Some before they move out, some when they are there. I cried twice before (once on my first friend who left's final night here, once on my last night, both times with a group of friends). Also I cried a few times when I got there, on odd nights where I'd feel really homesick! But then the rest of the time I'd be having so much fun, so it's still well worth it. And after a while you get really used to it, it's not like you can't visit often!