Looks like we are in the same boat I can tell u what I do I pray and pray over and over again beginning God to let my best friend forgive me maybe try that and I feel like a horrible person as well I can’t even look myself in the mirror but if that’s the case then that’s proof you are sorry and maybe ditch the toxic friend if you are around toxic people, people won’t wanna be around you, she seems like she’s doing a lot more harm than she is good