If the impending divorce isn't hard enough for Mariah Carey, the diva got hysterical upon learning that her ex-husband Nick Cannon was dating 'Hollywood Exes' star Nicole Murphy on Valentine's Day.

"It crushes her to see Nick land a gorgeous, thin woman," the source tells 'Life & Style.' "Mariah thinks he's just rubbing Nicole in her face. She'd heard through the grapevine that Nick was seeing her, but Mariah thought it was low for him to parade her around on Valentine's Day."

The 'Butterfly' singer finds it really handle to be alone and she is still hoping that she and Nick would be able to resolve things and get back together, reported Life and Style.

"She hates being alone and single. Now there's evidence Nick has moved on, and it hurts deeply," revealed the insider.

Mariah also threatened to drag the divorce so that Eddie Murphy's ex will eventually ditch him. Nick has told his friends that he's already seeing the idea of proposing to the slim chick.

"She sees it as a huge betrayal," says the insider to Life & Style. "Mariah's going to drag the divorce out, and if she gets her way, Nicole will get frustrated with Nick - and ditch him."

Nick Cannon and Nicole Murphy started dating earlier this month. The two were first spotted together in a dinner date with friends Bagatelle in New York City's Meatpacking District, reported News Every day.

In a report by US Weekly, Nick and Nicole were showing some romantic gestures to each other on Valentine's Day.

"Nick and Nicole had a late night romantic dinner on Valentine's Day at Tavern on the Green Saturday night. They were too into each other to pay attention - they held hands from across the table gazing at each other throughout their meal," the source said.

It was in January when Nick Cannon filed a divorce from Mariah Carey. They have been married for six years with twin kids Moroccan and Monroe.