Am I Overreacting?

I was out of town with my girlfriend for the weekend, and went to north carolina to help her cousins move into their new house. We were gone for about 3 days total. We have been together for about 8 months now and things are great. I'm 23 and she is 21. We love each other a lot and started saying about 3 months into it. I have never had any sort of trust issues with her at all, and would never suspect her of anything remotely close to cheating on me except for one situation in the past. She has been friends with this group of people at school and one of her close friends is this one guy she met in the fall and has known four about 7 or 8 months. I noticed awhile back that they had been talking and texting a lot and I confronted her about it, and she firmly said no there was nothing going on. She asked me if I trusted her and I said yea, and she responded back that they were just good friends and that she only sees him as that. Nothing else...and that I should not be worried about anything. While we were out of town this weekend, I noticed that she was on her phone a little bit more than usual. I had no idea who she was talking to, and it seemed a little bit odd to me as she seemed a little bit distracted. I have never looked through her messages...ever! Until now....earlier today, I looked at her messages to see who she was talking to and it was this guy from school, whom I know, and whom is the one we had a slight argument about when I confronted her in the past. He was also out of town for about a week so they didn't see each other in class like usual. Most of the texts were innocent, just random conversations like friends have, a few smiley faces here and there, and she was mentioning me a lot in the texts she was sending to him. Which in my opinion is a good thing. I had no problems with this until I saw one message that kind of got me worried. He said, I miss you, and she said I miss you! Then he responded well you will see me this week :) and she said Yea I know :) ....what the hell is this about?? I don't want to confront her if it's going to cause any drama. I really think it was innocent as friends sometimes say they miss each other and she hadn't seen him in a little more than a week. I'm not sure what to do...does anyone else have any opinions? She does mention this guy around me and others as well a fair amount of the time, which kind of annoys me but I've learned to deal with it. If she is so in love with me, and tells me that I'm the best thing that has happened to her in years, why is she telling another guy s he misses him. Is this innocent? Should I be worried? Please any feedback would be greatly appreciated! Thanks :)

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