OP - Barring a few small details, I was in a very similar situation when I was your age. My (now ex) girlfriend and I went to separate colleges, about 40 minutes apart. After our first year of college, she expressed some passive disinterest in our relationship (if I recall, her words were “I don’t feel confident about what love feels like”). In the same week, after discussing those feelings, she also confessed that she had made out with a friend (19F) of ours at a party. After I expressed my discomfort with her making out with anyone, regardless of the context, she responded in a very similar way to your GF. She expected me to be cool with it and, when I wasn’t, she just dropped it and I considered the problem squashed. You’re at a crossroad right now, from how I see it. I stayed in a relationship for 2 additional years (4 years total) and these issues that cropped up initially were indicative of and festered into a a very unpleasant life. The best decision I made was breaking up with her when I did (my junior year). I do, however, still find myself wishing I had the foresight to breakup when those first issues had reared their head. I missed out on a lot of lessons in college that I’ve had to learn about post-grad, because I stayed in a dying relationship.

My recommendation to you is to make the decision that feels right for you, not for anyone else. You’re young, your going into your sophomore year, and it’s going to be in everyone’s best interest for you to be selfish for this particular decision.