Jake Gyllenhaal and Taylor Swift
Jason Merritt/Getty; Kyle Rover/Startraks
02/28/2011 AT 3:00 PM ET
02/28/2011 AT 3:35 PM ET
When exes Taylor Swift and Jake Gyllenhaal bumped into each other at one of the Oscars’s most exclusive afterparties, it didn’t look like they were engaging in idle party chatter.
“They were outside near the restroom having a discussion,” a guest at the Vanity Fair bash tells PEOPLE. “It seemed a bit more serious – it certainly wasn’t a ‘Hi, how are you?’ talk.”
The musician, 21, and the actor, 30, started dating last fall but broke up in December.