Thanks for you input everyone. After I typed my original post, I was so distraught that I couldn't bare holding it in anymore. I called her and told her everything I did and know. She admitted to it and also said that it was the fact that her instructor throws around all these girls turns her on and her classmates. I asked her straight up though if she thought about him specifically when pleasuring her self. At first she was quiet bit admitted that she thought about him specifically.

Although we talked for the next hour and a half I couldn't help but still be upset. She said that she would never and has never acted on feelings of that sort. She also said that she felt disgusted after doing her deed and knew it was wrong right after.

We only see each other on the weekends which isn't that bad and usually for both days of the weekend. Plus I'm only 35-40 minutes away. She tells me sometimes that she has needs and because we don't see each other leads to this kind of thing. However, all throughout our relationship she has never had a high sex drive in the first place and has told me this many time, which doesn't bother me because its not all about sex. So you can see now why this whole situation on top of many other stresses in life (schooling and etc) really put me down.

As of right now, her last message to me was that she is confused and needs time to think. What that means, I have no idea. I doubt it means our relationship is on the line because other than this our relationship is great. But still a part of me worries and it worries deeply. I'm afraid to lose her. I am supposed to go over to her tomorrow but right now I'm not sure what is going on.