K-Stew said it was a "momentary indiscretion", but a source class it differently.

More information regarding the affair between
Kristen Stewart and
Rupert Sanders.
Following
K-Stew's public
apology where she claimed the affair was nothing but a "momentary indiscretion", Sanders' brother-in-law told press that it was much more than that.
Related: Kristen Stewart Apologizes For Cheating On Robert Pattinson With Married Director
Leopold Ross told
People UK that the two were cheating on
Robert Pattinson, and
Liberty Ross, from the second half of filming "
Snow White And The Huntsman" which was directed by Sanders.
"It was from the last half of filming and all through post-production, clear into last week."
Read: Robert Pattinson Moved Out Of The House He Shared With K-StewHe then added that his sister, despite going through a hard time after finding out about the affair will be better in time: "It might actually make things better in the long run. She wasn't that happy for a while, but our family is close, she'll be alright."
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