Megan Fox; Machine Gun Kelly.Photo: Kevin Mazur/Getty Images for The Recording Academy; Ethan Miller/Getty Images

Megan Fox Machine Gun Kelly

Megan Foxand fiancéMachine Gun Kellyare working on their relationship, a source tells PEOPLE.

After the actresshinted at a potential breakuplast month, a source close to the couple says that they are “in therapy” but Fox, 36, is “having a hard time trusting” MGK, 32, followingrumors of his infidelity, whichshe has since denied.

“This is really boiling down to not working,” the source says. “There have been points where they haven’t been speaking, it’s been that bad.”

Another insider explains that they are in contact and “still working on their issues,” adding: “Only time will tell if they get back together properly, but it looks pretty unlikely right now.”

Reps for Fox and Kelly have not responded to multiple requests from PEOPLE.

The insider notes that the couple has “always had kind of a tumultuous relationship,” which has “never been easy, it’s always been very up and down.”

Megan Fox and Machine Gun Kelly.Vivien Killilea/Getty for Universal Music Group for Brands

LOS ANGELES, CALIFORNIA - FEBRUARY 05: (L-R) Megan Fox and Machine Gun Kelly attend Universal Music Group’s 2023 After Party to celebrate the 65th Grammy Awards, Presented by Coke Studio and Merz Aesthetics’ Xperience+ at Milk Studios Los Angeles on February 05, 2023 in Los Angeles, California. (Photo by Vivien Killilea/Getty Images for Universal Music Group for Brands)

“Megan was thrilled when they got engaged, though. She really loves him,” the insider continues. “She was never one to casually date, so she put her whole heart into their relationship. She isn’t happy now, though. Shetook her engagement ring offa while ago, and it’s not back on.”

Fox notably appeared without theengagement ringon her finger when sheflew solo at theVanity FairOscars afterpartythis month.

At the time, she uploaded a series of photos of herself and a video of an envelope being burned in a fire pit and captioned that post with lyrics fromBeyoncé’s “Pray You Catch Me” from her 2016 albumLemonade, writing, “You can taste the dishonesty / It’s all over your breath.”

RELATED VIDEO: Megan Fox and MGK Are ‘Not Giving Up on Their Relationship’ but She Is ‘Still Upset’: Source

Upon her return to the platform, Fox shared a since-deleted post sayingthere was no cheating involvedin their relationship troubles. As of Friday, the actress’s Instagram still features no posts.

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A source told PEOPLE on March 14 that Fox and MGK are “still trying to sort through things, but most of their friends think it is likely over,” adding: “They’re just not ready to totally call it yet.”

Fox and Kelly first met on the set of the indie thrillerMidnight in the Switchgrassin March 2020. The musicianproposed to Foxin January 2022.

source: people.com