Helen Hunt splits from partner of 16 years, Matthew Carnahan

Actress Helen Hunt and writer Matthew Carnahan. Photo / Getty Images

Helen Hunt has allegedly split with her boyfriend of 16 years.

According to a Wednesday report from InTouch Weekly, the 54-year-old Oscar-winning actress - who is best known for her TV series Mad About You and the film As Good As It Gets - has ended her relationship with Matthew Carnahan, 56.

"The breakup was very messy," a source close to the actress told the publication.

DailyMail.com has reached out to Helen's rep for comment.

It was also claimed that they stayed together for as long as it did because of their daughter Makena, 13.

Matthew is best known for his shows Dirt with Courteney Cox and House Of Lies with Don Cheadle. Helen and Matthew first started dating in 2001.

The insider alleged that Helen "was convinced Matthew had strayed."

It was added: "She had been suspicious for a long time that something was wrong. But he insisted he didn't betray her."

The insider also said she could not get over her "trust issues."

"Their married friends would joke that they were jealous of their relationship."

But when the two were alone they would go head to head, it was claimed.

"Matthew moved out a few times over the years," said a source. "Helen would always take him back, and then time would pass and she'd kick him out again."

Helen was married to Hank Azaria from 1999 until 2000. Before that, the beauty dated Eric Stoltz (1992), Doc O'Conner (1991 - 1992) and Matthew Broderick (1987).

Carnahan is also father to son, Emmett from a previous relationship.