Can somebody help me out here??

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Ok so there's this movie that I watched a long time ago, but absolutely loved. Unfortunately, I forgot the name of it. So I'm going to try describing it and hopefully someone knows what I'm talking about. There's this guy and this girl who are in highschool and they have poetry class together. The guy is a real troublemaker and likes to do stupid things for attention. In the beginning of the movie he drinks some real nasty stuff in biology class. He asks the girl what she thought of it and she says he's a freak or something like that. After that he just keeps bugging her and won't let her pass in the hall and things like that and she really hates him. Then one day they both end up getting detention with eachother. This is where they first start getting to know eachother. Next semester, they have a poetry class together. They really start getting to know eachother and find out that they are not so different after all. They both have hard lives. The guy is abused by his father and brother and he feels horrible about himself because he can't protect his sister. The girl feels overwhelmed by the expectations of her family and friends. They both like eachother, but the girl doesn't want to admit it because she is afraid of what people will think. At a party, the girl ends up getting real drunk and sleeps with some other popular guy. The guy finds out and is really hurt and mad. He takes some acid in class and has a seizure. Then he just disappears and everyone assumes he's dead, but the girl ends up running into him like a year later or something. Ooookk, does anybody have any idea what movie I'm talking about?