Robert Pattinson, Kristen Stewart won't last - friends

Robert Pattinson's friends don't think his reunion with Kristen Stewart will last.

The British actor is said to have forgiven Kristen for cheating on him with 'Snow White and the Huntsman' director Rupert Sanders but those close to him are not sure they will be able to stay together for long.

MORE: Robert Pattinson and Kristen move back in together

A source said: "Rob believes that Kristen didn't sleep with Rupert Sanders, but the fact is, she still cheated on him.

"Rob's pals think it was easier for him to get back together with her right now because of the upcoming publicity blitz they are going to embark on to promote 'The Twilight Saga: Breaking Dawn'.

"Kristen definitely convinced Rob that this was going to be a bitter-sweet time for them, because this is the last 'Twilight' movie. Kristen loves Rob, no question about it, but she just isn't as mature as he is.

Rob's buddies would be stunned if the couple goes the distance."

Kristen's friends are also finding it hard to believe she and Robert - “ who are now back living together - will be able to maintain their relationship in the long-term.

The source added to RadarOnline.com: "Kristen and Rob's friends absolutely don't believe this reconciliation is going to last." 

Photo: Robert Pattinson, Kristen Stewart (BANG Showbiz)