How to fix my friendship?

so ive been best friends with this girl for about a year, we are..well were..so close and had never had a fight. the other night me and two other friends unintentionally ditched her for some boys, i didnt realise what i was doing until the next day. she has forgiven the other friends and they barely apologised i have said sorry countless times and tried to explain i didnt mean to but she cant forgive me and i absolutely hate myself for this..is there anyway to fix it?