"I'm deeply sorry for the hurt and embarrassment I've caused to those close to me and everyone this has affected," Stewart said in a statement Wednesday.
"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,"
The "Twilight" actor, 26, had been making plans to propose to Stewart, 22, his girlfriend - although only official now - of four years, Pattinson's friend told Us Weekly. He wanted to "spend the rest of his life with her," the source said.
Sanders said that he is "utterly distraught about the pain I have caused my family," in a statement to People. "My beautiful wife and heavenly children are all I have in this world. I love them with all my heart. I am praying that we can get through this together."
Despite the damning evidence, Rupert's father Michael Sanders brushed aside the scandal. "From what I gather nothing really happened and it is all a lot of fuss about nothing," the unconcerned father said. "I should imagine it was something very brief. She is a very pretty girl and when you work that closely with someone for so long, sometimes things happen."
Related: Kristen Stewart Cheating Partner Rupert Sanders Father Says: 'A Lot of fuss about nothing'
Katy Perry 'Has Been a Rock' for Robert Pattinson Following Kristen Stewart Cheating Scandal
Kristen Stewart Admits She Cheated, Apologizes to Robert Pattinson [Statement]
Kristen Stewart's Cheating Leaves Robert Pattinson 'heartbroken and humiliated'
