Girlfriend acting different, getting short with me, often very quiet!

Anonymous
Me and my girlfriend have been dating for almost a year now. It has been a wonderful relationship and an amazing summer. Unfortunately she had committed to study abroad in Germany this semester. We both agreed that our relationship was something great and that our trust for each other goes a very long way! Honestly I do trust her but something odd has been going on lately. Since we are so far apart, we obviously don't have any physical aspects to our relationship which is very hard! She has decided to come home a week early from her trip, and said that it had to do with missing home and friends and missing me!

Well that was about a month ago and she would constantly mention how she wanted to come home so badly. Well this past week, she has been acting very strangely. Usually I would always get an e-mail from her (at least one a day) and we talk on AIM for hours everyday. We have never had a hard time keeping a conversation going, and about a month ago.if someone asked, I think we could probably talk for days and never run out of things to say. Well this week, I was getting less and less e-mails from her and she was continually not online nearly as much as she usually is. And when she is online, its usually very short. Our conversations seemed to have taken a turn for the worse, she has lately been very short with me, almost angry, and when I ask if something is wrong she says nothing is. Usually we are both fueling the conversations with our input, but lately I've found it to only be me, trying very hard to get something going. She also has been a lot less "lovey" than she usually is. Almost every time we have talked in the past, she often is "spoiling" me with nice things to say but for the most part it has stopped. At the end of our conversations, she will say she loves me but it often seems very forced.

My question is.should I be worried? Is there another man in her life that she's hiding from me? Or have I just become so paranoid with the thought that its veiling what is really going on?
Girlfriend acting different, getting short with me, often very quiet!
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