Witherspoon and Gyllenhaal
Fernando Allende/Splash News; Stephen Lovekin/WireImage
and Jake Gyllenhaal
's springtime romance has ended.
"They just recently broke up. It's totally and completely over," a source in Witherspoon's circle tells PEOPLE.
"Reese was the one who had to do it," says the source. "She just got out of a divorce and was so concerned with her family, she just didn't have the time for him and he really demanded that."
Adds the source: "They're still friends. Things are fine, but it was a clean break – [there's] no chance of getting back together."
Reps for both actors did not immediately return calls for comment.
Witherspoon, 31, and Ryan Phillippe
, 32, who confirmed their split
in October after seven years of marriage, have two children: daughter Ava, 7, and son Deacon, 3.
The actress started dating Gyllenhaal
, 26, her costar in the upcoming CIA thriller Rendition,
in the spring.
Although they were careful to avoid the spotlight, they were spotted March 23 dining with two other couples at L.A.'s Il Sole and "being playful," an observer said at the time.
Although the pair didn't have much screen time together while filming Rendition
for eight weeks in Morocco, during a reshoot in L.A., "Jake went and reintroduced himself to Reese," a source close to both actors told PEOPLE
From there, said a friend of Witherspoon's, "Things slowly progressed, but it was never something she thought would happen from the start. She just kind of developed this little crush over time."
Reporting by JENNIFER GARCIA