An insider claimed that after a dramatic blowout between Goldie, 72, and Kurt, 67, the actress told her boyfriend that she'd "fallen out of love" after more than three decades together.
"There are whispers that things between them came to a head and Goldie left after their worst fight yet," a source close to the pair told Star.
"She said some things she didn't mean and regretted it later."
The source adds that, contrary to their loved-up couple-goals persona, Kurt and Goldie "have been living separate lives for some time now - and while they've enjoyed their independence, their arrangement may have finally taken its toll."
The iconic couple met on the set of 1968's The One and Only, Genuine, Original, Family Band and were brought back together 15 years later as costars in Swing Shift.
Though the two never married, they had son Wyatt, 32.
Though tension is still swirling following their fight, a source tells Star that Goldie and Kurt have the potentional to "turn it around."
"They've always dealt with a lot over the past few decades but they've always managed to get back on track, and the hope is that they can do it again," the source tells.
"No one wants them to say goodbye to each other for good."
The couple are yet to respond to Star's report.