Actress Kristen Stewart cheated on her boyfriend Robert Pattinson, almost costing their three-year-old relationship, but she is very sure that her "Twilight" co-star will not cheat on her as he is so faithful.

The couple parted ways in July after Kristen Stewart cheated on Robert Pattinson with her "Snow White and the Huntsman" director Rupert Sanders, prompting the actor to move out of their shared Los Angeles home.

Robert Pattinson was with some of the hottest women in Hollywood like Jennifer Aniston, Rosie Huntington-Whiteley, Cameron Diaz, Amber Heard and Evan Rachel at the Los Angeles County Museum's annual Art + Film Gala on Saturday night (Oct.27) but Kristen was said to be completely at ease as she has faith in him.

"Rob acted like a total gentleman at the gala. He was very polite to everyone. He spent most of the evening speaking with Tom Hanks and Steven Spielberg. He seemed to be in great spirits," Hollywood Life quoted an eyewitness as saying.

It was earlier reported that the couple is hopping from one place to another like gypsies ever since they reunited after a short breakup to avoid being photographed by paparazzi.

"Kristen and Rob have been house jumping to throw off the paps. They are living between three places: Rob's Los Feliz home, Kristen's new home in Los Feliz and Kristen's younger brother's house in Silverlake," HollywoodLife.com quoted a source as saying.

However, their house-jumping trick didn't work as they were photographed kissing at Stewart's new home.

Robert Pattinson and Kristen Stewart rekindled their relationship recently after staying away from each other following Stewart's affair with her director.

Kristen Stewart's affair with her "Snow White and the Huntsman" director Rupert Sanders, who is married with two children, almost cost her three-year relationship with her "Twilight" co-star.

She made a shocking revelation in July about her affair with Sanders and issued a public apology for cheating on Pattinson. The 41-year-old director, who is married to actress and model Liberty Ross, also offered an apology for his extra-marital affair.

Robert Pattinson and Kristen Stewart severed ties following the revelation before being reunited recently.