Nadine Arslanian left the lights on and TVs blaring at her Englewood Cliffs, New Jersey, home without even her children knowing where she was, The Post has learned.

And she left a “weird” typewritten note on the door for the man she was casually dating, that lover told The Post.

She then secretly flew for a week-long assignation with Menendez, the New Jersey Democratic senator, in the Dominican Republic in the spring of 2018.

Arslanian, 57, and Menendez, 70, married in 2020 and are now indicted on charges of selling his office to New Jersey businessmen for cash, gold bars and a car, and conspiring to act as secret agents of the Egyptian and Qatari governments.

Both of them strongly deny the accusations. Menendez will go on trial in federal court in Manhattan on May 13 and Arslanian will have a separate trial in July.

In the spring of 2018, Arslanian was newly involved with the senator and still in an on-again, off-again relationship with lawyer Douglas Anton.

Anton told The Post that she had dropped by his Hackensack, NJ, law office while he was assembling furniture one Thursday and the two had agreed to meet later that evening at her Englewood Cliffs home.

“I texted her, but instead of blue, the text went green,” said Anton, a former attorney for disgraced musician R. Kelly, adding that he grew increasingly alarmed when he arrived at her home and saw a note affixed to her front door.

“My love, I’m going away to see my girlfriend last minute as I need some time to de-stress. Be back Monday. Love you,” the note said. The note was typed, which Anton said he found “weird.”

New Jersey Sen. Bob Menendez is facing federal corruption charges related to an alleged years-long scheme.

Menendez allegedly accepted bribes, including gold bars, in exchange for helping three businessmen, Wael Hana, Jose Uribe and Fred Daibes, and the country of Egypt, according to officials.

Menendez and his wife, Nadine, were charged with taking hundreds of thousands in bribes, according to a Manhattan federal indictment.

When the feds raided Menendez’s Englewood Cliffs home in June 2022, they found a 2019 Mercedes C-Class, at least 13 gold bars, and $566,000 in cash “stuffed in envelopes.” Another $70,000 in cash was found in Nadine’s safe deposit box.

Menendez and his wife, Nadine, were charged with taking hundreds of thousands in bribes, according to a Manhattan federal indictment.

The feds say Menendez also received mortgage payments and paid for a low-show or no-show job and home furnishings.

This isn’t the first time the Democrat is facing federal corruption charges. In 2015, Menendez was accused of taking gifts from Florida eye surgeon Salomon Melgen.

The “gifts” included a Paris vacation, flights on a private jet, and vacations at Melgen’s villa in the Dominican Republic.

Anton said he wasn’t too upset because he was also dating someone else at the time, “and the idea of a Nadine-free weekend was rather appealing.”

But when she didn’t return on Monday, he began to worry, he told The Post, adding that he called her sister, her adult children and friends, “who also had no idea where she was, that she left, and were very concerned.” Her sister insisted he call police, Anton said.

“It wasn’t like her to do this, and days went by, so I went to the cops,” he said.

“I did a missing persons report, and they had to come to the house to check to make sure that someone didn’t kill her and put her in a closet.”