Swimfan (2002)

A new girl comes to a school and immediately takes to a student on the swim team. When she finds out that he already has a girlfriend, she pretends not to mind. She tries to convince him to leave her but when he wont, she take' s things into her own hands.

This is a suspenseful movie, I give it a 4.5 out of 5.

Starring Jesse Bradford (Bring It On, Presumed Innocent, King of the Hill, Shooter) as Ben Cronin, Erika Christensen (Traffic, Flightplan, Parenthood, Adopted) as Madison Bell, Shiri Appleby (The Thirteenth Floor, Charlie Wilson' s War, Roswell, UnREAL) as Amy Miller, Kate Burton (Big Trouble in Little China, Unfaithful, Max Payne, 127 Hours) as Carla Cronin, Clayne Crawford (A Walk to Remember, Lethal Weapon series, The Baytown Outlaws, Tinker') as Josh, Jason Ritter (Freddy vs. Jason, W., The Education of Charlie Banks, About Alex) as Randy, Kia Goodwin (227, Platinum, The Good Wife, DC Noir) as Rene, Dan Hedaya (The Usual Suspects, Clueless, Blood Simple., The Big Take) as Coach Simkins, the late Michael Higgins [1920-2008] (Angel Heart, State and Main, Dead Bang, The Conversation) as Mr. Tillman, Nick Sandow (Orange Is the New Black, The Wannabe, In the Blind, TIME: The Kalief Browder Story) as Detective John Zabel, Pamela Isaacs (Oz, Third Watch, One Life to Live, Season of Youth) as Mrs. Egan, James DeBello (Detroit Rock City, Cabin Fever, Scary Movie 2, American Pie) as Christopher Dante, Phyllis Somerville (Little Children, Stoker, Surviving Family, Diane) as Aunt Gretchen Christopher, Tom Cappadona (Bringing Out the Dead, Bait, The Orchard, May It Be) as Janitor and Malcolm Barrett (My Best Friend' s Wedding, The Hurt Locker, Timeless, Larry Crowne) as Jock.

https://www.imdb.com/title/tt0283026/