Cheating "jeopardized the most important thing in my life," she says

Kristen Stewart is issuing a public apology for hurting her boyfriend of three years, Robert Pattinson, by having a fling with her Snow White and the Huntsman director, Rupert Sanders.

“I’m deeply sorry for the hurt and embarrassment I’ve caused to those close to me and everyone this has affected. This momentary indiscretion has jeopardized the most important thing in my life, the person I love and respect the most, Rob. I love him, I love him, I’m so sorry,” Stewart said in a statement Wednesday.

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News of Stewart’s infidelity with the 41-year-old, married director comes about four years after the couple met while filming the first installment of Twilight, the vampire smash that thrust them into the spotlight before the film even arrived in theaters. Buzz that they were a real-life couple took off almost immediately.

As Pattinson, 26, and Stewart, 22, have become increasingly open about their relationship, they’ve been photographed kissing and keeping cozy on date nights in Los Angeles.