A source tells E! News that while "there was lots of animosity after the split," the two have "moved on and gradually gotten over it."
The insider added that "they are cordial now" and that pals "honestly believe they will not get back together."
"There's always a small chance," the source added. "But I highly doubt it."
Either way, those close to Robsten were "completely surprised" to learn that they had been spotted together earlier this week.
E! News exclusively revealed that the two were seen leaving the same meet-up spot in their respective vehicles, Rob in his Jeep following Kristen in her blue Toyota pickup truck.
A separate source says that friends are concerned about the former couple's recent reunion.
"He was on a break from talking to her," explained the source. "Rob was doing incredibly well and getting over her, she hurt him so much."
The British heartthrob seemed to take the breakup of "his first proper true love" extremely hard.
"He doesn't want to date anybody right now. He's throwing himself into his work and feeling under a lot of pressure because it's an important time in his career," the source told us.
"He doesn't want any distractions."
That said, it looks like he was able to set aside some quality time for his former on-and-off screen love.
For more photos and exclusive details—including where Rob and Kristen spent that time together and for how long—don't miss E! News tonight at 7 p.m. & 11:30 p.m.