Gabby Petito and Brian Laundrie were having problems even before the fateful cross-country road trip that ended with him allegedly killing her before eventually taking his own life.

Fox News and obtained a 366-page document released by the FBI that included a copy of an undated letter Petito wrote to Laundrie before their trip.

“Brian, you know how much I love you, so (and I’m writing this with love) Just please stop crying and stop calling me names, because we’re a team,” Petito wrote in the letter, which included a reference to the couple coming back from New York. “And I’m here with you. I’m always going to have your back.”

Petito also apologized in the two-page, handwritten note for getting upset over “a dumb piece of paper,” while she tried to comfort Laundrie.

“I love you so much it hurts,” Petito wrote. “So you in pain is killing me. I’m not trying to be negative, but I’m frustrated there’s not more I can do.”

Petito repeatedly wrote of her love for Laundrie while also apologizing for alleged transgressions she doesn’t name and pleading with him to forgive her.

“I hope you understand when I’m upset it’s cause you make me love you too much,” she wrote. “Now…stop crying! And come home and say you love me with a big hug.”

The FBI released the documents more than three months after the Petito and Laundrie families settled a lawsuit filed by the Petitos for an unspecified amount.

Petito’s parents were seeking $100,000 for pain and suffering due to the alleged actions of the Laundries. It is unclear how much, if any, money they will receive in the settlement.

Laundrie is believed to have committed suicide after he went missing following the murder of his fiancée, whom Laundrie admitted to killing, according to the FBI. His remains were found in Florida’s Myakkahatchee Creek Environmental Park in October 2021, and his family’s attorney released the notebook found with his body in June 2022.

“I ended her life,” Laundrie wrote, according to a copy of the notebook exclusively provided to Fox News. “I thought it was merciful, that it is what she wanted, but I see now all the mistakes I made. I panicked. I was in shock.”

Laundrie went on to claim that Petito, who was 22 when Laundrie strangled her to death, had injured herself in a fall while they were visiting Wyoming and that he killed her to take “away her pain.”

“Rushing back to our car trying to cross the streams of spread creek before it got too dark to see, to [sic] cold. I hear a splash and a scream,” Laundrie wrote, adding that he carried her as far as he could but had to stop to make a fire to keep them warm when he couldn’t make it back to the couple’s van.

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He claimed Petito “had a small bump on her forehead that eventually got larger” and that she “continually made sounds of pain, laying next to her she said little lapsing between violent shakes, gasping in pain, begging for an end to her pain.”

Laundrie also referred to Petito’s death as his “mistake” and insisted that he was not ending his life “because of a fear of punishment but rather because I cant [sic] stand to live another day without her.”

Petito and Laundrie were driving across the country visiting national parks when Petito went missing. She was last seen alive in late August before her family reported her missing in early September after Laundrie returned to his parents’ home in Florida without her. Laundrie’s family then reported him missing on September 17.

Petito’s body was found in Grand Teton National Park in Wyoming on September 19, 2021. Laundrie’s remains were found on October 20.