Why did she break up with me?

I go out partying every singe night and get drunk. She's like, "well get out of my life now! I don't need want to date someone who gets drunk all the time..I don't need that! I don't want that!" I tried giving her a hug and she's like, "JUST GET THE HELL AWAY FROM ME! I DON'T WANT TO BE WITH SOMEONE WHO DRINKS ALL THE TIME! I WANT SOMEONE WHO DOESN'T DO THAT ****! NOW LEAVE ME THE HELL ALONE!" We're both 18.