Robert Pattinson was "making preparations to spring a proposal" on Kristen Stewart before she cheated on him, it has been claimed.

The actor was said to be weeks away from asking his long-term girlfriend and Twilight co-star for her hand in marriage when their relationship was rocked by pictures of Kristen getting close to director Rupert Sanders.

Insiders claim that the Hollywood heartthrob has now left the mansion he bought with the intention of making it their family home and has not spoken to the brunette beauty.

"Robert hoped to marry Kristen and was making preparations to spring a proposal before she admitted cheating. He had bought the house in Los Angeles to be their home and saw them staying there for a long time," a source told British newspaper The Mirror. "Now Rob is angry he's left the mansion and not spoken to her since. They have exchanged heated text messages only."

Meanwhile, insiders claim that Rupert's wife Liberty Ross is likely to forgive the Snow White and the Huntsman filmmaker for his indiscretion.

The Vogue mannequin-and-actress is reportedly taking a pragmatic view on the scandal and is not ready to give up on her marriage.

"Liberty is hurting. But she's realistic. Things happen and marriage isn't easy she just hates the fact her name's been dragged into all of this. Rupert has apologised profusely and she has accepted his apology. She hopes things get back on track after all, they have kids together," an insider said.

Rupert's father Michael has also spoken about the alleged affair and dismissed it as "a lot of fuss about nothing".

He doesn't believe a lot was going on between the 22-year-old actress and the 41-year-old director.

"From what I gather nothing really happened and it is all a lot of fuss about nothing. She is a very pretty girl and when you work that closely with someone for so long, sometimes things happen," he told The Mirror.