Glee's Dianna Agron didn't exactly sing a wistful ballad following her split from actor Alex Pettyfer after nearly a year together.
PHOTOS: Biggest Hollywood splits
Since moving out of the L.A. home she and the I Am Number Four star shared about two weeks ago, Agron, 24, "is staying at a hotel under an alias" a source reveals in the new Us Weekly, out Wednesday.
Why the secrecy? Pettyfer, 20, has been "a psycho loose cannon" in the aftermath of the split, another insider says.
PHOTOS: Love lives of Glee's stars
On Feb. 18, according to an eyewitness, he got into a heated confrontation at a West Hollywood club with actor Sebastian Stan -- furiously accusing the Black Swan star of hooking up with Agron.
"Dianna is terrified of [Alex]," a pal explains, adding that he "absolutely lost it" and threatened Agron during a vicious phone chat. (Pettyfer's rep tells Us he made no threats.)
PHOTOS: See what Dianna and other Glee stars really looked like in high school
To read much more about the ugly breakup, pick up the new Us Weekly, out Wednesday.
Get more Us! Follow us on Twitter, Friend us on Facebook, Subscribe to Us Weekly
See where the cast of "Cruel Intentions" is today.
The Rock flexes massive muscle while getting sentimental on Celebs Gone Social hosted by Wonderwall editor Chris Gardner.
Rihanna, Katy Perry, and Heidi Klum all get an F on this week's Fashion Offenders.
Sarah Michelle Gellar talks to Wonderwall's Chris Gardner about "terrifying" paparazzi, growing veggies with her daughter, why she never went to rehab.
From Mila Kunis to Mary-Kate Olsen, get the scoop on all the engagements in Hollywood on Replay.
From Christina Aguilera to Jennifer Hudson, see some of Hollywood's ever-changing waistlines.
Nicole Richie debuts a lavender hair color on Instagram on Celebs Gone Social. What does Kelly Osbourne have to do with it?
© 2014 Microsoft