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Donald Trump may continue to deny he had affairs with Stormy Daniels, Karen McDougal or other women, but there’s one person who was once close to him who knows all too well that he’s not always the most loyal of husbands.

That’s his first wife Ivana Trump, the mother of Donald Jr., Ivanka and Eric.

The one-time Czech model, now 69, has recalled in a new interview with the New York Post how she divorced her real estate CEO husband in 1992, soon after she learned he was cheating on her with wife No. 2 Marla Maples.

Because of that betrayal, Ivana Trump feels sorry for Trump’s wife No. 3, Melania Trump.

“I feel bad for [Melania] because I know how bad I did feel. It hurts a lot,” said Ivana, who is also the grandmother of nine.

Ivana Trump is no doubt referring to allegations that Trump, now 71, cheated on the first lady in 2006 with porn star Stormy Daniels and former Playboy Playmate Karen McDougal.

Trump’s alleged encounters with Daniels and McDougal took place when the then-“Apprentice” star was working and traveling in California, including to a Lake Tahoe celebrity golf tournament in July 2006. At the time, Trump had been married to Melania for a little more than a year, and she was a new mother to their son Barron. McDougal also claims she had a 10-month affair with Trump after meeting him at a party at the Playboy Mansion.

Ivana Trump said she couldn’t live with a man while always wondering whether he was being truthful when he said he was at work or going to play golf. “I cannot do it,” she said.

But Ivana added that different women have different ways of handling an unfaithful husband, especially if a woman is married to a high-powered man like Donald Trump, and a divorce would lead to her losing social status or financial security.

“I have pride and I have dignity and stuff like that, but so many women, around the world, they live with the men knowing that they are cheating and stuff like that,” Ivana Trump said. “Everybody handles their situation their own way.”

Ivana Trump also recognizes that Melania Trump may be “stuck” in her current situation — both in her marriage and in being first lady.

“It’s a hard adjustment because she cannot go anywhere,” Ivana Trump said. “She cannot go shopping, she cannot go out to the theater, she cannot go to restaurants because she has Secret Service and 15 cars in front and 15 in back. So she’s sort of a little bit stuck in the White House — and Donald is busy from morning to night and he’s a workaholic — so I’m not sure how much you really can do.”

But when it comes to cheating husbands — or men alleged to have been unfaithful — Ivana Trump isn’t so hard on her oldest son Donald Trump Jr.

Shortly after Donald Trump Jr.’s wife Vanessa filed for divorce in March, headlines blared with reports that he had cheated on her in 2011-2012 with singer Aubrey O’Day, who had been a contestant on “Celebrity Apprentice.”

“It’s always distressing, because I’ve been there,” said Ivana of her son’s cheating allegations. “But who am I to judge and who knows what was the situation at that moment?”

It was reported that Vanessa Trump learned about the affair when she found emails between her husband and O’Day. She had given birth to the third of their five children several months earlier.

Page Six quoted a source as saying that a hurt and angry Vanessa “was going to leave (Trump Jr.) then.” Discovering the affair was the start of “the downfall” of their marriage, Page Six said.

With Us Weekly reporting that Trump Jr. and O’Day allegedly continued their relationship through the first three months of 2012, that would have been around the time that Vanessa Trump became pregnant with their fourth child.

“It’s a long time ago now, so I think Vanessa knew it all along and maybe she just couldn’t get over the hurt to forgive him,” Ivana Trump said. “But I honestly don’t know that many men who can keep their zippers up.”

Still, Ivana Trump is not going to give her son too hard of a time.

“He knows with Vanessa he made a mistake so I would not punish him anymore. He has enough of the problem as it is and five kids to raise,” Ivana Trump said. Then again, she suspects that her son won’t have any trouble picking up the pieces of his personal life and one day finding a new woman to make a life with. After all, she said, he’s “good-looking” and successful.

Ivana Trump worries, though, about her soon-to-be former daughter-in-law finding a new mate.

“Maybe Vanessa might have a little problem because she has five kids . . . who is going to date and marry the woman who has five children?” Ivana Trump asks. “Especially since she is young (40) and she might want to have more.”