I have been kicked out how do i convince him to let me stay?

[LaydeePisces]

I live with my stepdad and I'm not really sure why but i think i was mad at him sunday and i sent a text to my mom saying i can't stand him and he's really mean but i accidently sent the text to him and he showed it to me and i didn't really respond. Then he says "I think you should be out by this weekend, I can't do this anymore." I don't know where I'm going to go and i can't just transfer schools because then i may not graduate, my counselor said it's too late in my senior to transfer. It's four months left in school how do i convince him to let me stay for the remainder of my senior year. I was already planning prom and planning to run track and im doing a senior slideshow at my school and i don't want to leave all of that behind. I also wrote him a letter apologizing and explaining and he gave it back to me. HELP!