Miley Cyrus' ex Patrick Schwarzenegger is coming in like a wrecking ball — and ruining her relationship with Liam Hemsworth!

Life & Style has exclusively learned that the Australian actor recently discovered texts from Patrick on the 23-year-old singer's phone and totally flipped out.

MORE: For More Exclusive Content, Sign Up For Life & Style's Newsletter!

"Miley keeps saying it was one-sided and she doesn’t care about Patrick at all anymore," says a source, "but Liam is worried Miley isn’t being up front."

l&s cover

MORE: Miley Cyrus and Liam Hemsworth Sing Justin Bieber in Adorable Car Ride Duet — Watch!

And the 26-year-old has good reason to be concerned. "Miley was in love with Patrick before he cheated on her, and he would love to have Miley back in his life,” the source explains.

For more on Miley and Liam, pick up the latest issue of Life & Style, on newsstands now! And see the couple's cutest moments in the gallery below.