90 Day Fiance star Paul Staehle has revealed he's returning to the United States alone after wife Karine Martins decided to divorce him during the couple's recent trip to Brazil.

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"Tomorrow I board a boat back to Manaus to fly home," Paul wrote in a recent Instagram Stories posting.

RELATED LINK: '90 DAY FIANCE' COUPLES NOW: WHO IS STILL TOGETHER? WHO HAS SPLIT? WHERE ARE THEY KNOW? (PHOTOS)

According to Paul, he will be leaving both Karine and their son Pierre Martins Staehle behind in Brazil.

"I will miss Pierre very much. There is no Western Union or moneygram to send money here. Seeing Pierre on a motorcycle being carried around with no protective gear has me seriously on edge," Paul continued in his Instagram Stories message.

"But Karine says I need to respect her culture. Here babies on motorcycles with NO PROTECTIVE gear is very normal. Mosquitos are much more intense [than] I remembered."

Paul concluded, "The lack of air conditioning has me famished."

Karine, 23, confirmed earlier this month she's filing for divorce from Paul.

One day after Paul claimed on Instagram Karine had "started divorce proceedings in Manaus," Karine confirmed she's leaving the father of her child once and for all.

"Yes, I am looking for a lawyer now," Karine told Us Weekly on November 12.

Paul alleged at the time Karine was planning to take their son and travel to Tonantins on the Amazon River, which is over 500 miles upstream from Manaus.

Paul had implied he was not invited to join his family on the trip, but he did not reveal his own future plans.

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"Tomorrow, little buddy goes with Karine to Tonantins on the boat. I'll miss you, little guy! I'm going to miss you so much. Do you hear me? Dad's going to miss you!" Paul said in a sweet voice in an Instagram Stories video.

Paul had been hoping to head up to the Amazon and convince Karine to live in the United States with Pierre -- either with or without Paul -- but it appears Karine did not listen.

"I just want the best possible life for my son... I have to get back to work soon so I pray this ends as positively as possible," Paul said earlier this month.

Karine is originally from a remote village in Tonantins, but she and Paul were living in an apartment in Manaus before Karine was able to move to Louisville, Kentucky earlier this year.

Paul and Karine's marriage seemed to fall apart shortly after they celebrated their two-year wedding anniversary on November 3.

Paul and Karine, who met online and fell in love in Brazil, wed in 2017, but their wedding didn't air until the following year on Season 2 of 90 Day Fiance: Before the 90 Days on TLC.

Following their stint on 90 Day Fiance: Before the 90 Days, they allowed cameras to film them for a new spinoff, the debut season of 90 Day Fiance: The Other Way, which wrapped in late October.

RELATED LINK: '90 DAY FIANCE: BEFORE THE 90 DAYS' COUPLES NOW: WHO IS STILL TOGETHER? WHO HAS SPLIT? WHERE ARE THEY NOW? (PHOTOS)

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After two devastating miscarriages, Paul and Karine had another shot at parenthood when they happily announced in October 2018 they were expecting a baby. Later that month, Paul revealed Karine was pregnant with a baby boy.

Right before the couple's son Pierre was born on March 22, however, Karine threatened to file for divorce from Paul because of his ongoing trust issues. Karine also hated how he lost his temper during arguments.

"I really want a divorce. I am tired of what Paul does to me," Karine said in a confessional during one episode of the series.

"He lives in the past and too many fights make a relationship fall apart. There's no more hope. I'm thinking of my son now."

The 90 Day Fiance: The Other Way season even showed Karine and her mother leaving Paul behind in Tonantins and traveling to Manaus to file to divorce shortly before Pierre was born.

However, Karine ultimately decided to give Paul another chance when he stepped it up in the delivery room and was very supportive, and she moved to the United States a few months later on a CR-1 spousal visa.

Karine and Paul documented their time together in America over the course of several months, and they appeared to be a happy family in the summer.

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But speculation the 90 Day Fiance couple's volatile relationship was once again on the rocks first began in early September when Paul had made an Instagram Stories posting claiming Karine was threatening him with divorce -- again.

"Doing a poll strictly out of curiosity. For someone I know very well...... Should a wife divorce her husband over his mother buying gifts daily spoiling their son?" he wrote in the Instagram Story.

"Should a grandmother be banned from seeing her grandchildren over spoiling them. And a husband be divorced for defending his mother's actions?"

Although Paul seemingly tried to play it off like the scenario was happening to some other couple, most of his Instagram followers knew better as the couple's social-media postings openly showed they were living near Paul's mother in the Louisville at the time with Pierre.

As a result, it appeared Karine was angry with Paul's mother for "spoiling" her son as well as Paul for taking his mom's side.

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Things seemed to go back to normal until late September, when Paul suggested, once again, the couple's marriage was ending and Karine had initiated a divorce.

According to the comments, Karine told Paul that she didn't want him in her life anymore and had retained a divorce lawyer. 

RELATED LINK: '90 DAY FIANCE: HAPPILY EVER AFTER?' COUPLES NOW: WHO IS STILL TOGETHER? WHO HAS SPLIT? WHERE ARE THEY NOW? (PHOTOS)

Paul revealed the news in a pair of since-deleted Facebook postings from September 27, according to screenshots captured by his followers.

"Karine asked me to remove our photos. And let everyone know that she doesn't want me in her life," he wrote in his first Facebook posting.

Paul then also wrote a subsequent posting in a mix of Portuguese and English.

"Karine advogado de divorcio me ligou. Guess I need a lawyer," he wrote.

Translated to English, the Portuguese text states, "Karine's divorce lawyer called me."

Shortly afterward, Paul deleted both postings and removed most photos of Karine from his page.

Late last month, however, Paul and Karine put on a united front when Paul asked fans on Instagram for great haunted-house recommendations in the spirit of Halloween.

In addition to revealing he was trying to plan a date for his wife, Paul posted a photo at the time of Karine and himself smiling.

RELATED LINK: '90 DAY FIANCE' COUPLES NOW: WHO IS STILL TOGETHER? WHO HAS SPLIT? WHERE ARE THEY KNOW? (PHOTOS)

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