why is this girl soooo mad at me??

so we are in high school , This girl who is my friend (i think ) her boyfriend tried to get at me on facebook. He kept talking to me and trying to get at me while he was with her. So im like helll nooo Stop talking to me or else .! then he’s like we can be friends ? and i’m like i guesss but don’t text me or message me on facebook cuz that’s disrespectful of you. she’s my friend and you can’t be doing that shit. Weelllllllll i guesss my friend found out that HE WAS messaging me and stuff so now she told me she wants to fight me ! 😫like what????? why fight me ??? you should fight ur un loyal asssss cheating boyfriend of urs . so now she doesn’t like me anymore and doesn’t want to talk to me , AND her friends dont like me either which WERE my friends too so now everyone hates me and i’m getting depressed because it wasn’t my fault 😣 what shoukd i do? I kept trying to talk to her and explain to her that HE MESSAGED ME FIRST and showed her everything but she still won’t believe it

i have 0 friends now