Avril Lavigne and Mod Sun have gone their separate ways.

In February 2023, a source close to the couple told PEOPLE that they are "no longer together" after being on and off for months.

This comes after the "Sk8er Boi" singer said "yes" to Sun's proposal on March 27, 2022.

"It was the most perfect, romantic proposal I could ever ask for. We were in Paris on a boat in the Seine River. We had a violin player, champagne and roses. It felt like time stood still, and it was just the two of us in the moment," Lavigne told PEOPLE exclusively.

Lavigne and Sun (whose real name is Derek Smith) first connected through music after collaborating on a song together in the studio.

The "Complicated" singer was featured on Mod's 2021 single "Flames." In addition, he co-wrote and co-produced several tracks on her most recent album Love Sux, which came out in February 2022.

The couple sparked relationship rumors in February 2021 when they were spotted leaving dinner together at BOA Steakhouse in Los Angeles. The Grammy-nominated singer and her former beau were known to double-date with Megan Fox and Machine Gun Kelly.

This would have been the third marriage for Lavigne, who split from Nickelback's Chad Kroeger in 2015 after two years of marriage. She was also married to Sum 41 frontman Deryck Whibley from 2006 to 2009.

Take a look back at the couple's relationship timeline ahead.

January 2021: Avril Lavigne and Mod Sun First Meet

Although Lavigne wasn't looking for love at the time, her feelings instantly changed after meeting Sun in the studio during a writing session for Mod's 2021 single "Flames." She recently opened up to PEOPLE about the start of their relationship.

"I knew we had a very strong unstoppable connection from the first week of writing and working together in the studio. Immediately," said Lavigne. "He made every day better. It was like I had known him forever. As time went on, things kept getting better, and it felt incredibly natural."

Despite the songstress' concerns about jumping into a new commitment so soon after getting out of a long relationship, she said she "just followed [her] heart." She explained, "I got together with [Mod Sun] to write a song. We just clicked. I was like, 'Should you be doing this?' It was fun and exciting, and I decided, 'F--- it. Life's short.' I'm a Libra. I love love."

Jan. 22, 2021: Avril Lavigne and Mod Sun Appear in "Flames" Music Video Together

Sun debuted the music video for his single "Flames" on Jan. 22, which features Lavigne. The video opens with Lavigne's vocals as she's sitting on the ground of a dark, foggy cemetery. The punk rock-infused anthem kicks in as Sun belts the chorus as he's surrounded by pyrotechnics.

About halfway through the video, the pair is seen playing instruments back-to-back with Lavigne on keys and Sun on drums. The shot flashes back and forth between the rockers singing face-to-face while fire is all around them, seemingly symbolic of their fiery passion for each other.

Sept. 9, 2021: Mod Sun Expresses His Love For Avril Lavigne on Instagram

After months of posting promotional content with each other for "Flames," Sun professed his love for Lavigne on Instagram with a PDA-filled picture paired with a sentimental caption in September 2021. Through a carousel of images, the first photo sees Sun kissing his girlfriend on the cheek.

"I'm so lucky, I love this girl so much😍 internet killed the rockstar tour starts today! come see me + my band…I love my life + I'm so grateful to have all of you on this journey with me," Sun wrote.

Sept. 12, 2021: Avril Lavigne and Mod Sun Make Their Red Carpet Debut

The pair stepped out in edgy fashion when they made their red carpet debut as a couple at the 2021 MTV Video Music Awards. Lavigne, who presented an award that evening, rocked a hot pink plaid suit alongside her boyfriend, who wore a black suit covered in patches.

Sun posted highlights of the night on his Instagram, including a photo of the couple kissing on the carpet. "Everything is a dream when I'm with her….." he wrote.

Sept. 27, 2021: Mod Sun Celebrates Avril Lavigne's Birthday on Instagram

There's no denying that the "Flames" songwriter has a way with words, both musically and romantically. Sun penned a tribute to the "radiant" and "graceful" Lavigne on her 37th birthday, whom he described as his "soulmate," "angel," and his "favorite person in the world."

"...You have made my dreams come true in so many ways. You are my calm in the chaos + my shelter from the storm. You are elegance + rock n roll wrapped up in one body. I was born without you, dying to find you, I'll always remind you….I love you with all my heart @avrillavigne + the best is yet to come. Happy birthday my little icon 💚" Sun captioned the compilation of Instagram photos of the two together.

Feb. 14, 2022: Mod Sun Posts a Sweet Valentine's Day Tribute to Avril Lavigne

Sun expressed his love for his girlfriend with a cute photo and heartfelt caption on his Instagram for Valentine's Day. The shot pictures the rocker sweeping Lavigne off her feet as he walks towards the ocean.

"The love of my life. It would take me a lifetime to list off the reasons why I love you. You are my soulmate + the person I was born to be with. I would do anything in this world to protect our love. You live deep within my heart. We're gonna last forever. Happy Valentine's Day ❤️," he captioned the post.

April 3, 2022: Avril Lavigne and Mod Sun Kiss at the 2022 Grammy Awards

Lavigne and Sun turned heads at the 64th Grammy Awards when they shared a kiss on the red carpet before the ceremony, where the "Complicated" singer was a presenter.

Donning an outfit significant to her album, Lavigne rocked a custom MOI MOI Paris high-low gown with a waistband that read Love Sux, finished with a tiered tutu skirt. "I wore a dress like this in a photoshoot and I was like 'Oh my God, I love this so much' so we contacted the designer," she explained on the PEOPLE & Entertainment Weekly red carpet Grammys pre-show.

April 8, 2022: Avril Lavigne and Mod Sun Get Engaged

Mod proposed to Lavigne in Paris on April 8 and took to Instagram to share the exciting news. He got down on one knee with a ring that was very fitting for the "City of Love" as it was a custom-designed, heart-shaped ring set in a royal setting with little hearts from XIV Karats from Beverly Hills.

"The day we met I knew you were the one. Together forever til our days are done. I had a dream where I proposed in paris. I pulled out a ring + asked you to wear it. I was on one knee as I looked in your eyes. You're too beautiful for my words to describe. I grabbed your hand + took one last breath…I said "will you marry me?" + she said 'yes,'" Sun captioned a series of engagement photos. "I love you Avril ❤️"

"Oui! Je t'aime pour toujours 🤍💍🥂Dimanche. 27. Mars. 2022," Lavigne shared in her own set of pictures, showing off her heart-shaped engagement ring.

April 19, 2022: Avril Lavigne and Mod Sun Throw a Paris-Themed Engagement Party

Shortly after their engagement in Paris, the couple celebrated with a fun party that paid tribute to the City of Love. Complete with miniature Eiffel Towers, macarons, and pink berets, the duo was all smiles as they posted pictures of the party on their Instagram Story.

Machine Gun Kelly — who has collaborated with Lavigne on music and is set to share the screen with Mod in his film Good Mourning — also posted a photo of the party's signature drink, lattes with foam art of the couple's engagement in front of the Eiffel Tower.

Aug. 28, 2022: Avril Lavigne and Mod Sun walk the VMAs red carpet together

The newly engaged couple walked the red carpet at the MTV Video Music Awards in matching punk-rock looks. Lavigne was dressed in an all-black Versace ensemble that included a long-sleeve corset top and wide-leg trousers, while Sun sported a denim fit designed by Maison Margiela. They each accessorized with belt chains.

Lavigne was a presenter at the award show and was also nominated for best alternative video.

September 27, 2022: Mod Sun pens sweet birthday poem for Avril Lavigne

Sun celebrated his fiancée's 38th birthday with a poem that he posted on Instagram.

"When I close my eyes it's you I see. You're the reason why my heart still beats. My love is yours eternally. I live inside each memory," he wrote. "Your eyes light up the darkest night. Your kiss inspires the words I write. Your touch is all I need in life. Someday soon you'll be my wife."

Sun concluded: "You changed the world Avril never forget. You are that mother f---ing princess. You make me better I must confess. I'd whisper 'I love you' with my last breath. There's so many words I wanna say, To my stunningly gorgeous fiancée, I'll leave it at this til we runaway…. Baby I wish you a happy birthday."

February 2023: Avril Lavigne and Mod Sun call off their engagement

Lavigne and Sun decided to call it quits 10 months after getting engaged.

"Avril and Mod Sun have been on and off for the past two months, but are no longer together as a couple," a source close to the exes told PEOPLE.

On Feb. 19, the "Girlfriend" singer was spotted having dinner with rapper Tyga at Nobu in Malibu, California.

"Avril and Tyga are genuinely friends and nothing more. There was absolutely no third party involved in the split," a separate source said.

That same night, Sun kicked off his God Save the Teen tour in Sacramento, California, and a rep for the singer gave a conflicting statement about the couple's relationship status.

"They were together and engaged as of three days ago when Mod left for tour, so if anything has changed that's news to him," the rep said.

February 28, 2023: Mod Sun says his heart is "broken" after Avril Lavigne split

In a post on Instagram, Sun opened up about his breakup with Lavigne.

"In 1 week my entire life completely changed…I just know there's a plan for it all," he wrote. "I'll keep my head up + always listen to my heart, even when it feels broken 💔 I have the best friends in the entire world, thanks for always having my back."

April 2, 2023: Mod Sun says fans "saved" his life following split from Avril Lavigne

Sun spent six weeks on tour following his breakup with Lavigne. During his final show, which took place in Los Angeles, he told the crowd that his fans "saved" his life after the split.

The artist also told attendees that he's renaming the song he wrote for Lavigne from "Avril's Song" to "Los Angeles Song."

"Probably not a good idea to name the song after the person you're with at the time," Sun said with a laugh.

July 7, 2023: Mod Sun releases song about Avril Lavigne

In his track "Strangers," Sun detailed his breakup with Lavigne.

"Our first fight / I saw your true colors, your bad side / Pictures on the internet you can't hide / Soon as I go out of state, I'm out of mind," he sings, likely referring to Lavigne's sudden relationship with Tyga after calling off the couple's engagement.

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