girlfriend doesn't like my best friend

hey guys, I have been going out with gf for a year and a few months. I introduced her to my best friend and they immediately clicked. However me and my gf had a really serious argument later on and i got my friend involved to take the place as the neutral party to bring us back together. However, my gf claims that my best friend sent her abusive text messages whilst she playing the neutral party. I asked my gf to show me the text messages my friend sent but she claimed she deleted them but the the txt convo's she and my friend had months ago, are still on there. My gf refuses to apologizes or speak to my best friend untill she apologizes. My best friend also claims she did not send anything of that sort and tbh..i find it impossible to see my best friend doing that. Me and my gf live on campus so it's not like ever see my best friend as she lives back in my hometown. I am stuck between the two. I really love my gf and i have known my best friend longer (5 or 6 years). My best friend has helped me so much and i probably would be in a really bas position if not for her. My gf wants me to end my friendship with my best friend and i have repeatedly told my gf that i will not as she has done so much for me. Every single day me and my gf argue about this. She blows a fuse, whenever she See's me communicating with my best friend on fb etc. I am confused as to what to do. My gf is threatening to end the relationship if i don't cut contact with my best friend. I have tried to arrange a meeting between the two but they both refuse to meet, unless one or the other apologies first. I am confused as to what to do. Anyone??

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