Adam Levine is, well, in misery.

After his Sports Illustrated swimsuit model girlfriend of two years, Anne Vyalitsyna, dumped him, she announced it to the world April 2 without giving him a heads-up.

"It was a cheap shot," a pal tells the new issue of Us Weekly (out now). "Anne didn't want it to look like he broke up with her."

PHOTOS: Love lives of supermodels

The Maroon 5 frontman and Voice mentor, 33 -- who was home in L.A. when Vyalitsyna broke up with him from NYC -- "was blindsided," says a Levine pal. "Adam's heartbroken. He wasn't even fully sure they were really broken up."

PHOTOS: The Voice mentors, then and now

Though Levine didn't predict a split, friends of the couple saw it coming. "Anne said he didn't pay her enough attention," a friend of the model, 26, tells Us.

VIDEO: Adam Levine and Christina Aguilera duet on The Voice

Another gripe: Levine wasn't planning to propose anytime soon. "As a woman, you get to a point where you want to get married," an insider explains. "Adam wasn't ready to take that step."

For more details on their split -- including how Vyalitsyna is already "telling people she wants to meet guys" -- pick up the new issue of Us Weekly, out now!

Get more Us! Follow us on Twitter, Friend us on Facebook, Subscribe to Us Weekly