Kristen Stewart says Robert Pattinson is BAD in bed?

According to a new story on Perezhilton.com, Kristen Stewart told her friends that Robert Pattinson was BAD in bed.

Gossips claim that's why she cheated and fooled around with a married father.

One source actually says Rob's found out and now he's super pissed. They say:

"Rob couldn't believe that Kristen was telling everyone that he's bad in bed. Not only did she cheat on him, she humiliated him. Now that he's heard about the rumors she's been spreading, there's no chance [of permanent reconciliation]."

Meanwhile, US Weekly reported today that Robert Pattinson and Kristen Stewart have moved in together again in an L.A.-area home. This coming just 10 days after their tearful and dramatic reconciliation in which Rob forgave Kristen for her affair with her Snow White and the Huntsman director Rupert Sanders.