OP, I can see where your concerns lie, but I agree with other posters in that you should be talking to your GF about what happens in her classes/labs. Communication and honesty is key to every relationship! :yes: If you're not comfortable with the situation, tell her and she should be able to help you understand the bigger picture of what happens in nursing school!
My SO is currently in nursing school and has told me what happens in classes where contact has occurred with anybody in the class, male or female. From hand-feeding one another, shaving other people's faces to "caressing" arms to practice putting needles in. We try to elaborate our day to each other, so we don't have mundane conversation, so that counts for a part too. "How was your day?" "Good/Boring/Stressful because _this happened_"
What I have trouble with is that the SO refers to everyone as "my classmate" and "my friend." Just a habit my SO has since I have never met any of the classmates. I would prefer that the SO refers to everyone by their name and a small description, just so I have an idea about who is being talked about! :rolleyes:
And admit to your insecurities, it just makes you all the more human. :alien: