Actress CHERYL HINES guilt-ridden over tragic suicide shocker of beau BOBBY KENNEDY JR’s wife MARY and may deep six their romance, sources say.

“Cheryl knew Robert was in a bitter divorce battle, but he never warned her that Mary was suicidal with jealousy,” said a source close to the “Curb Your Enthusiasm” beauty.

“She’s been wracked with guilt since Mary’s death, and she’s decided to put some ‘space’ in their relationship. Robert is insisting they can still make a go of their romance, but Cheryl is talking like a woman who wants out.”

Kennedy, 58, was separated from Mary, his wife of 18 years and the mother of their four children, when she hanged herself on May 16. He’d been dating 46-year-old Cheryl – now starring in the ABC sitcom “Suburgatory” – since late 2010, and the two regularly attended high-profile events together.

They went to actress Glenn Close’s birthday party on April 15 and Cheryl posed with Robert and his two daughters at a New York charity gala for his River­keeper foundation on April 26.

Cheryl – who’s filed for divorce from her husband, producer Paul Young – also posted messages on Twitter about her blossoming romance with Bobby Jr.

“Cheryl now knows that boast­ing online about her relationship was a dreadful mistake,” said the source.

“She’s told pals that she can’t sleep at night thinking about the pain she unknowingly caused Mary.”

A Kennedy family insider noted another reason why Cheryl is likely to give Robert the boot.

“Robert cheated on Mary constantly over the years,” said the source.

 “Any sen­sible woman would have to think seriously about a last­ing relationship with a man like him.”