Sylvester Stallone & Jennifer Flavin Divorce: Why They Split

Sylvester Stallone and Jennifer Flavin are divorcing after 25 years of marriage, and now a source is revealing what went wrong.

A Hollywood insider told People magazine that Sly and Jennifer "are very different people, age-wise and in temperament," adding, “What was once exciting and challenging is now routine and irritating."

The source insisted "disagreements on little things add up after so many years together."

Another source had previously told People something similar, saying, "It really wasn't just one issue that made her file for divorce. They have had lots of issues for years and she just had enough."

Meanwhile, a Flavin source tells the mag that Stallone’s impulsiveness is also an issue. “He tends to do things on a whim without asking her before," the insider said.

There was also a clue in Jennifer’s divorce filing earlier this month. She claimed Stallone “engaged in the intentional dissipation, depletion and/or waste of marital assets which has had an adverse economic impact on the marital estate."

Stallone, however, has denied the accusation in his own filing.

Last week, TMZ reported that a big fight over Stallone’s dog Dwight had caused the breakup, leading Flavin to file for divorce.

Stallone shut down the claim, telling the outlet in a statement, "We did not end the relationship on such a trivial argument. We just went in different directions. I have the highest respect for Jennifer. I will always love her. She's an amazing woman. She's the nicest human being I've ever met."

Prior to the dog story making headline, Jennifer broke her silence about the split.

She told People, “I'm sad to announce that after 25 years of marriage I have filed for divorce from my husband Sylvester Stallone. While we will no longer be married, I will always cherish the more than 30-year relationship that we shared, and I know we are both committed to our beautiful daughters."

Jennifer added, "I ask for privacy for our family as we amicably move forward.”

Breakup rumors were already swirling about the couple, after Sly had a tattooed image of Jennifer on his right shoulder replaced with a dog.

Sly’s rep, however, claimed that the tattoo news was a misunderstanding, telling DailyMail.com, “Mr. Stallone intended to refresh the tattoo image of his wife Jennifer however the results were unsatisfactory and, unfortunately, unfixable. As a result, he had to cover the original image with a tattoo of his dog from ‘Rocky,’ Butkus.”

The rep went on, “Mr. Stallone loves his family. The Stallones are presently filming a reality show together which will debut on Paramount+.”

Fueling split rumors, Jennifer also posted a photo with their three girls with the caption, “These girls are my priority. Nothing else matters. The 4 of us forever.”

Earlier this year, the Stallones appeared on their daughters Sophia and Sistine's "Unwaxed" podcast, on an episode called "Stallone Family Therapy." The interview is now hauntingly ironic.

Sophia comments that her mom and dad are "polar opposites" but "literally cannot live without one another."

When asked what they do for each other, Jennifer says, "I keep him extremely organized... So I do everything from the minute we wake up to getting him coffee... I go through your schedule, you tell a few jokes, I laugh, that's what keeps us going." She adds, "He's the funniest man I've ever met."

Stallone teases, "I just aggravate the hell out of her," before adding, "I think she's fantastic, an amazing woman. I tell her that every day. I don't know how she holds it together. She's just amazing, but she's a little crazy... When I say 'crazy,' I mean 'good crazy.'"

When asked about how they keep their relationship "young and fun," Jennifer says, "We just don't take it too seriously."