Roseanne and Johnny met in 2002, shortly after she divorced her third husband, Ben Thomas, when he was hired to write a blog for her.
The couple began dating a year later and have been inseparable ever since.
'Johnny is deeply concerned about Roseanne's mental health,' a source spilled to Star.
'Between the Twitter scandal and the show's cancellation, he fears she could suffer a breakdown.
'He's doing everything he can to be a supportive shoulder to cry on, but he has no intention of marrying Roseanne - now or ever!'
Neither Roseanne or Johnny have responded to Star's report.
This week on TV podcast, Binge List, we discuss the returns of Arrested Development and The Karate Kid (as spin-off series Cobra Kai). Plus, what’s the verdict on Love Island Australia? We also take a look at hilarious spy thriller Killing Eve, crime docuseries The Staircase and comedian Ali Wong’s Netflix specials. Listen below, or on iTunes: http://po.st/syE3JF or via OMNY: http://po.st/28BGXd