i was set up, please help?!?

okay so this guy at my school asked my friend for my phone number right, and this was on wednesday. Hes my ex's best friend and i thought it was kind of weird, anyways he texted me calling me cute and stuff being weird i hardy responded to his texts he was annoying and immature about everything i showed no interest at all in him, so on friday he texted me saying he was lending his brother his phone for the weekend so not to text the one (iwasnt going to anyway) lol but on saturday i woke up to some really inappropriate text messages really early in the morning. and i thought it was his brother ( he had told me his brothers a psycho and hes really weird) so i thought it was his brother since he was lending his phone to him for that weekend. So i was ignoring him and he called me 23 times. i ignored them all, and then i get some texts from a different number with the same area code, saying "hey its julian, i lost my phone text me from here" so i ignored it. then come to find out it was his girlfriend, my friend told me she was a psycho threatening to kill herself if he ever broke up with him, and that shes super jealous. so it was her i guess, and shes like its julians girlfriend you dumb *****, and again remember, i showed NO interest in him WHATSOEVER. and shes like he didnt want anything to do with you he used you and all this im just sitting here thinking, how did he use me? i never even texted back to him or even talk to him. and then i texted his phone saying this "julian if you get this i dont want anything to do you with you and i never have, if you have a girlfriend thats cool but i wasnt trying to get at you in any way shape or form. i dont know if its your girlfriend texting me this or your brother byt thats not cool and i was just barely your friend and now im getting threatened? not cool." and he never wrote back but today at 12;38 pm i received a text from him saying "hey answer" amnd i said no" and he said "really quick i need to tell you something" and i said no, so he ended up saying "alright well whatever i just used you for revenge to get back with her and like i never wanted anything with you so yeah we had nothing idk what you were thinking you mean nothing to me so just **** off and dont reply dont even call this number or text it at all and you were the one threatening her so yeah" LMAO. i cant even omg anyways, so i just said i dont care it means nothing you were nothing to me whatever. then an hour ago i sent this. "just to clear things up YOU were the one who asked around for MY number. YOU were the one texting me calling me cutie and ****. i didnt flirt with you i didnt even text you. So if your girlfriends gonna be mad at anyone, she should be mad at you. i dont think your cute, i dont have ANY type of feelings for you, not even a friend. and i probably never will, with that being said, goodbye. "

Now i know shes gonna be at my school tomorrow looking for a fight, i will knock her out to be honest but i dont know i cant get this off my mind how ******* ridiculous this is. what do you guys think? what should i do. i need good advice and nothing rude please. thank you all <3