When sadness sets in sometimes we have to dig for the reasons. Is it missing the routine of your old life? The people, the familiar places, the memories and times? I think that it's all of that. When being apart from those things, it makes you feel alone, but you know that you have to leave to be able to come back and the possibility of coming back sooner looms on the horizon so that's a good thing. And you want to tell people that you might come home sooner, but you also want to surprise them, being away makes you realize just how good the friendships that you have are, and just how much sweeter coming home will be.