Tell her that you will not hook up with or date your classmates because you love her and she could become your wife. Don't talk about how it would mess things up for you. That won't really reassure her. It's normal that she's jealous, it means she loves you and she doesn't want to lose you. Until you start the program, remind her how much you care about her as much as you can. When you start the program, make any time you can spend with her count. And if you can, and she's okay with it, spend time with her even if it involves you studying while she sits on the couch next to you and reads a book (or include her and she can help you study by quizzing you). Even if you call her on your study group's 10 minute break to let her know that you miss her, it will help make her feel special. Also, always let her know how good it is to see her or talk to her after spending all day at clinicals or in class. You're nursing friends will be good friends, you'll study with them and they'll understand aspects of your life as a nursing student that your girlfriend wont. Include you're girlfriend as much as possible though. Introduce her to your nursing friends, so she can develop a relationship with them also. If you're talking to your nursing friends about something that your girlfriend doesn't get, explain it to her, so she doesn't feel as excluded from that area of your life.
I hope that helps. Girls are very action-based most of the time. If you act like she is a priority by telling her and including her, she will understand that she's a priority. When you don't act or tell her that she's important in your life (just as much as nursing), that's when her mind will wander and she will assume that if you aren't acting like it or telling her, then she isn't. Good luck!
Quote from ThePhilster
She has some concern, but honestly I don't blame her. I'll be going to school with lots of beautiful nursing students and we will all be working closely together. Also they say your classmates in nursing school become friends for life. This closeness with other girls seems to always threaten the current girl in your life in my experience. Also she said that I probably wont have that much time for her. 1 day per week I'm guessing?? I start nursing school in 1 year from now.
I do not plan on hooking up/dating any of my classmates because 1) I love my girlfriend and she could possibly become my wife 2) I do not want to jeopardize in anyway my schoolwork.