My ex friend ruined my life and i might end it all

Okay i know the title is super depressing but honestly what happened a few days ago left me absolutely broken. So i met this one girl, Ill call her Zero. So Zero is a year older than me and she seemed so cool at first. She was kind to me and gave me tips on how to dye my hair better. 

But i soon noticed how...idk how much she lacked empathy. I lack empathy too and i seriously cant feel sorry for people or animals. Im still kind to everyone and i try not to hurt peoples feelings. But Zero was different. She talked shit about people, made fun of them, bullied them and spread rumours. I obviously didnt like this and told her to stop but ofc she didnt. Okay so Zero has my tiktok accounts password bc i trusted her back then and later on forgot to delete my acc from her phone.

One evening i get into a fight with Zero. Im mad at her bc she bullied my gf and called her a retard. I blocked her on everything and i thought that was the end of it. I was so wrong.

A few hours later i go on tiktok and notice something terrible. All my videos are deleted, my  friends are blocked and my user name has changed into a slur. I immediately know whos behind this. Surprise surprise its Zero. I quickly message my friends and gf on WhatsApp and told what happened. Apparently she had send horrible messages to my friends on my acc and even sent a break up message to my gf pretending to be me. 

I go on Zeros acc and click on her story. (I was using my alt acc) Its filled with disgusting things about me and my gf. She mocked my gfs eating disorder, called her a piggy, leaked our private messages, tagged our both accounts, doxxed my address, name and the school i go to and some horrible lie about me. She said that i said her rapist was hot and i told her to go deeper when cutting. News flash! i did none of those never!! Apparently Zeros other friends harassed my gf too. They tried to feed horrible lies about me to her, said she needed to break up with me and said other horrible things about her. they bullied her super badly nonstop.

Its been a few days now and i dont know what to do. Ive been getting 'go cut yourself', 'kys' etc messages and it doesnt seem to stop. Im still together with my gf but this has taken a lot of damage to our relationship. I honestly dont know what to do and i want to end it all.

ik this is kinda a shorted version of the story but there is just so much more to tell. If yall want a more in depth version lemme know

peace out