Sanders, 41, made his first post-scandal appearance on Monday, stepping out in Los Angeles looking gaunt but with his wedding ring prominently on display. Still, the state of his union remains a question mark.
"It's too early to say what they're going to do," a source tells E! News. "They have a lot of stuff to sort out."
That stuff could include the timeline of what K.Stew billed as a "momentary indiscretion" in her pitiable mea culpa.
Amid rumblings of Stewart and Sanders' alleged on-set chemistry comes a Fox News report that claims Us Weekly had been tracking the story for a while after someone dropped a dime about their affair.
"They had a tip that Kristen was cheating on Rob with her director, so not only did they have photogs on Kristen, they had photogs on Rupert as well," explains a source.
And the shutterbugs hit the jackpot when Stewart and Sanders conducted their tryst in broad daylight (see more pics here).
So, should Rob cut his losses and move on? Should he try to forgive Kristen? Keep clicking to see their "Twilight"-centric romance in pictures, then tell us what you think ...