|Robert Pattinson and his sisters|
The 'Twilight' star's siblings, Lizzy and Victoria Pattinson, have warned him against getting back with his ex-girlfriend - who was caught cheating with 'Snow White and the Huntsman' director Rupert Sanders - saying she's liable to do it again.
A source told RadarOnline.com: "They will kill him if he gets back with Kristen.
"Lizzy and Victoria feel terrible for heartbroken Robert, especially because of the embarrassment that was caused by the manner in which the affair was exposed.
"It's a case of once she's cheated, what's to stop her doing it again? And Lizzy and Victoria are pretty unforgiving over Kristen's actions."
The protective sisters are instead recommending the heartthrob throws himself into his work and a bachelor lifestyle.
The source added: "They believe Robert should embrace singledom, throw himself into work and not consider settling down with anyone until he's ready."
Robert, 26, has already put the Los Angeles love nest he shared with Kristen, 22, up for sale and is thinking of moving back to London, where he can be more of a "regular guy."
Another source said: "He never fell in love with Los Angeles and has always longed for home. When Kristen was shooting 'Snow White and the Huntsman' in London, he made his excuses to visit her as much as he could - he missed it so much.
"Despite making friends in America, Robert longs just to have a pint with the mates he grew up with in a local west London pub. He's just a regular guy.
"He is set to make up his mind very soon. His family hasn't put pressure on him to return, but he misses them very much and they've said they'd welcome him back with open arms."