Bestfriend fight..helpppp!!?

[Heyyyyyy]

okay so i used to have this group of people i would hangout with everyday and we were all soo close. but when fights would go down, everyone chose sides...so one big fight went down and i got mad at this one girl and then another friend that choose her side got mad at me causing us to fight..i said some pretty messed up things..thigs i am soo discusted that i would even repeattt !! i tried appologizing and she said were okay just not friends..but i still feel terrible for what i did..anyone have any suggestions on what else to do ? i misss her alot and just want things to go back to normal like they used to beeee. dont tell me anything dumb. im a teenager, i make mistakes as everyone else and i just want opininions on how i could fix this...?? pleaseeeee