My best friend and I are in a fight, what should I do?

Here are the details: She and I have been friends for years but she just got her first boyfriend and since we went off to different colleges we obviously haven't been able to see each other much so when she comes back to town, we always make plans. Lately she has been ditching me (I don't find out about her ditching until I call her or from other people). We had a spat before this over her ditching me a few times and she apologized saying she wouldn't do it again and we made up. This week she just left town for LSU where her bf is and didn't tell me until I was calling her to talk about times for our movie plans that we had made days before. We got into a fight about it and now we've been arguing back and forth. She claims that I "bully her" and now she wants to "stand up for herself". But she ditched me and hasn't apologized or admitted that it was wrong and just insists that we didn't have plans, even though we had talked about going to the movies for three straight days before she left for LSU. Now I don't know what to do, I want to be friends again but neither of us will back down from our positions. I tried to get her to come over to talk it out but she refused and now Im out of ideas to resolve this problem and when I talk to her she just makes me so angry that I don't want to resolve it. I'd like your thoughts about this and maybe someone outside of the situation can help. Thanks!