Megan Fox is “done” with Machine Gun Kelly after finding out he’s been talking to other women behind her back, a source exclusively tells Page Six.

“When they went away for Thanksgiving, she became suspicious and decided to go through his phone,” our insider says.

The 38-year-old Transformers star “found text messages about other women and decided she was done with MGK, whose real name is Colson Baker.”

The “Jennifer’s Body” actress has always had “trust issues” with the 34-year-old rapper and singer-songwriter “due to past behavior.” They’ve also had their ups and downs over the past few years, but she was willing to look past them, says our insider.

Megan wanted to “rebuild her trust with Colson and was looking forward to growing their family together,” our source explains.

However, when she discovered the text messages, she changed her mind.

“Megan is a strong, independent woman and doesn’t need a man in her life,” explains our insider.

Representatives for Fox and MGK did not immediately respond to Page Six’s request for comment.

As we previously reported, the on-again, off-again couple, who are expecting their first child together, split over Thanksgiving weekend in Vail, Colorado.

The couple’s split came just two weeks after the Midnight in the Switchgrass actress announced she was expecting her fourth child and her first with MGK.

On November 11, Fox shared a photo of her caressing her stomach while covered in oil. She also posted a snapshot of a positive pregnancy test.

“Nothing is ever truly lost. Welcome back 👼🏼❤️,” she captioned the carousel of photos while also tagging the “Bloody Valentine” rocker.

The actress is already mother to her and her ex-husband Brian Austin Green’s children: Noah (11), Bodhi (9) and Journey (7).

MGK welcomed daughter Casie, now 15, with her then-girlfriend Emma Cannon in 2009.