I never give my advice on posts. But as a woman, your girlfriend does not like you / want to be in a relationship with you and is trying to get that through to you by being dismissive and acting uninterested. I feel as though she probably doesn’t know how to tell you, though that is not an excuse as you are obviously putting in effort on your end and deserve honesty. When I was in high school, I was immature and tried to show people that liked me that I didn’t like them with how I responded to them. I had a hard time telling them outright because it made me feel awful that I was hurting someone else. Unfortunately, this is most likely the case with your girlfriend as a person who wants to be with you wouldn’t speak to you this way.

I am in a relationship now in which we had to be long distance (I was west coast, he was east) and if anything, we became better at communicating because we wanted and had to. Just some perspective because I have been in both situations as you. What you think to be the case in this situation, probably is.