I’m looking for a movie about a group of teens who bully a girl and eventually kill her?

So the movie starts off with the a guy hooking up with a girl and eventually finding out he has a girlfriend. So the girlfriend finds out and starts torturing the girl at school(high school) and pulling pranks on her like one with her underwear in a pool being videotaped. Eventually the girlfriend demands for her... show more So the movie starts off with the a guy hooking up with a girl and eventually finding out he has a girlfriend. So the girlfriend finds out and starts torturing the girl at school(high school) and pulling pranks on her like one with her underwear in a pool being videotaped. Eventually the girlfriend demands for her boyfriend to kill her and cut out her heart. The police get involved and try to protect her but eventually fail. The boyfriend kills the girl when she is home cuts her heart out and throws it into a river or lake with the knife. I think it came out between late 90s or early 2000s.
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