Needed a women perspective: Girlfriend is mad that I don't want to go with her on this trip

My girlfriend was invited on a trip to Tempe Arizona with by her best friend and best friend's boyfriend. She wants me to go with her. It would be a couples trip. She started the conversation saying "I know you don't like Tempe Arizona." I don't like Tempe Arizona. I have not been their since I graduated ASU and she knows exactly why I won't step foot Tempe Arizona ever again. I went to ASU because I was told it's a fun party college. Well now I don't even look at my degree because it brings back bad memories. I will never got back to Tempe Arizona. She keeps trying to convince me and say it will be fun. It's not going to be fun for me. Then she said how I know that college towns can be dangerous and she would like her man with her. Since her best friends man will be worried about protecting her best friend. I don't want to go to Tempe Arizona! She knows why I won't go to Tempe Arizona! I told her to take her brother is she will feel safer with a man there with her but she keeps saying she wants me and it won't be the same. I don't get why she can't understand and respect that I don't want to go there and never will want to go there.