Pete and Chasten Buttigieg met on a dating app and became one of the most talked-about couples in the 2020 election. Here's a timeline of their relationship.

In 2015, Pete was a first-term mayor in South Bend, Indiana, and Chasten was a grad student in Chicago. One day, when Chasten was at O'Hare International Airport in Chicago, he came across Pete's profile on Hinge, a dating app. Chasten said he remembers Pete making the first move and that they talked about "Game of Thrones."

From there, the two started chatting on FaceTime regularly.

"Those FaceTime dates had gone so well, but I was just so tired of being let down," Chasten wrote in his 2020 memoir, "I Have Something to Tell You."

In his memoir, Chasten recalls setting up a coffee date with Pete, but when he got stuck in traffic on his way from Chicago to Indiana, he had to cancel. Pete quickly rescheduled for dinner later that evening.

That night, Pete took Chasten to an Irish pub in South Bend and had him try a Scotch egg, and they talked about having children one day. After dinner, Pete took Chasten to a local baseball game and then for a walk along the river to see fireworks.

"I was soaring," Chasten wrote in his book. "It was like a made-for-TV movie."

In a 2018 interview with the New York Times, Pete said, "Literally, there were fireworks on our first date. It was kind of ridiculous, I know, but I was hooked."

After just a few months of dating, Chasten met Pete's parents at their weekly Sunday night dinners. Chasten said he remembers Pete and his father doing most of the talking at dinner and that he felt nervous whenever Pete's father addressed him directly.

"South Bend was quickly starting to feel like home," Chasten wrote in his memoir. "So less than six months after we had started dating, I moved in with Peter."

Since Chasten first found Pete's dating profile while waiting at gate B5 at O'Hare International Airport in Chicago, the location became important to them. In 2017, they returned to the boarding gate, and Pete asked Chasten to marry him behind the gate agent's desk.

In his memoir, Chasten recalled Pete saying that "life with him would always be this way, if I were okay with it — sneaking moments away, an adventure both coming and going."

"I really, really hadn't seen it coming, but of course I said yes," Chasten wrote. "I spent the whole flight looking over at Peter. How did I get so lucky?"

The couple had a 30-minute ceremony at an Episcopal church in South Bend, which included a reading from the 2015 Supreme Court case that made same-sex marriage legal across the US. After the ceremony, the couple stopped by the South Bend Gay Pride Week block party for a brief celebration before heading to their wedding reception.

"We have a lot of people coming from other places, and we wanted to give them a window and a glimpse into this really cool city," Chasten told The New York Times in 2018. "People think Indiana must be a drab place to be."

Although just newlyweds, Pete and Chasten were launched into the national spotlight when Pete announced he was running for president of the United States during a speech in South Bend. He became one of the first openly gay men to run for president.

"My name is Pete Buttigieg," Pete said in the speech. "They call me Mayor Pete. I am a proud son of South Bend, Indiana. And I am running for president of the United States. I recognize the audacity of doing this as a Midwestern millennial mayor. More than a little bold — at age 37— to seek the highest office in the land."

At the end of the speech, Chasten came on stage, and the pair kissed.

"Sometimes when he's on the road and I'm missing him, I just take a deep breath and watch this to remind myself what we're here for," Chasten tweeted, including a campaign video.

As Pete campaigned the traditional way, Chasten helped bring attention to the candidate via social media, with his quick wit and honest tweets. Today, he has over 500,000 followers on Twitter.

"That visibility is unusual for a spouse or partner at such an early stage in the primary process, let alone a gay couple that remains one of the youngest in the Democratic field of more than 20 candidates," The Hill wrote in 2019.

The cover story, "Mayor Pete Buttigieg's Unlikely, Untested, Unprecedented Presidential Campaign," profiled the young mayor while also focusing on the couple's marriage.

"Their marriage is at once banal and extraordinary, infused with the exuberant contentment of two people who once thought they would always be alone," the magazine wrote. "Chasten handles the dogs, the shopping, the cooking. Pete does the dishes, laundry, and garbage. Chasten hates taking the bin out to the curb. Pete hates the way Chasten folds T-shirts. Chasten gets grumpy when they go too long without food, and Pete doesn't get it."

"One year ago I married the love of my life," Pete tweeted with a black-and-white photo from their wedding day. "I'm so thankful I found you, Chasten, and can't wait to spend the rest of our life together."

Chasten also took to social media to celebrate, writing, "On my way to find this cute guy on the trail. Can't believe it's been one year."

At a caucus watch party in Des Moines, Iowa, Pete took the stage to celebrate his historic win as the first openly gay candidate to win a caucus in the US. During his celebration speech, Pete thanked Chasten.

"To the love of my life, keeping my feet on the ground, how about a hand for the future first gentleman of the United States?" he said in the speech. "Let's hear it for Chasten."

After the speech, the two embraced on stage.

When Pete announced he was ending his campaign for president, Chasten gave a speech that made headlines.

"About a year and a half ago, my husband came home from work and told me, well, he asked me, 'What do you think about running for president?' And I laughed. Not at him but at life," Chasten said at the last campaign event in South Bend. "Because life gave me some interesting experiences on my way to find Pete. After falling in love with Pete, Pete got me to believe in myself again. And I told Pete to run because I knew there were other kids sitting out there in this country who needed to believe in themselves too."

Before he introduced Pete to the stage to officially end the campaign, Chasten said, "It has been an honor and a privilege to share my husband with the rest of this country."

When President Biden nominated Pete for his Cabinet, Pete was quickly confirmed in the senate as the transportation secretary, becoming the first openly gay Cabinet secretary. During the confirmation hearing, Chasten sat right behind him.

Later in the day, Vice President Kamala Harris swore Pete into office, while Chasten held the bible during the ceremony.

"You can really feel the history swirling around us when the vice president was swearing me in with my husband, Chasten, at my side," Buttigieg told NBC News.

With Pete's new job, the couple has now moved to DC.