Fans were surprised fans when the two got engaged in July, only five months after they started dating. Their whirlwind romance appeared to be the real deal, with Lovato, 27, admitting that she knew she loved Ehrich, 29, the moment she met him.
Fans first noticed the two were getting flirty on social media in March, as Lovato left a teary-eyed emoji and a red heart on one of the actor's videos. ET then confirmed the lovebirds first got together that month, with a source sharing at the time that the pair was "greatly enjoying spending time together."
As we say goodbye to another Hollywood couple, here's a look back at their time together.
Ask and you shall receive. Before they were even on each other's arm, Ehrich was a fan of his future bride-to-be.
On Dec 26, 2011, he tweeted, "All I wanted for Christmas was Demi Lovato. #cantalwaysgetwhatyouwant…."
Fast forward nine years and some months, and the pair was getting flirty on social media. After Ehrich posted a shirtless photo of himself on March 23, Lovato left the comment, "Fine by me…," to which he replied with a smirk emoji face and a red heart.
A couple of days later, Lovato accidentally made a cameo appearance on Ehrich's Instagram Live video. Unaware that the actor was livestreaming himself playing the piano, the former Camp Rock star entered the shot with a blanket, seemingly to wrap it around his shoulders.
The two finally made things Instagram official, confirming their love by posting video of themselves in Bieber and Grande's "Stuck With U" video.
"my whole heart," Ehrich wrote, while Lovato added on her post, "Happy to be a part of something so special right now. Like really REALLY happy if you can’t tell..."
The newly confirmed couple had some fun on Lovato's Instagram Story, lying in bed together.
In the clip, Lovato was rocking a beard and unibrow filter and telling her beau, "I am so glad that you stayed with me during this quarantine. You know, even though I haven't really been able to get my brows done."
Ehrich then interrupts her by attacking Lovato with kisses as she giggles.
Ehrich couldn't help but show off his "amor," by posting a photo of her on May 15.
By the end of the month, the PDA was through the roof with their sizzling pool pic.
The "I'm Ready" singer flaunted her romance with her boyfriend on her Instagram Story on May 21. Lovato posted a selfie of the two kissing, as well as another one of her smiling wide and hugging the actor. The cutest pic she shared was one of them holding their dogs.
Lovato used a "Love" and "Family" GIF to caption the sweet snap.
"Had an amazing weekend in the magical desert of Joshua Tree with my love @maxehrich ❤️.. I went to work on a project but it was so nice to get away for a couple days.. thank you for making me so happy my dear.. I love going on adventures with you," Lovato wrote on her pic.
"I have so much fun with you and there’s so many things I want to say right now but I want to be present and spend this bday with you so I’ll be quick: Being with you makes life SO MUCH FUN ??," she began, adding that they "act like hooligans" and don't care if they embarrass themselves in front of others.
He also posted adorable pic of them together.
The couple took their love to the beach. In a nighttime beachside pic, the lovebirds are all smiles as they lean in for a kiss.
Lovato couldn't help but gush about her beau, writing, "this might be my favorite pic of us so far." She also thanked him for "making me the happiest I love yew soooo much @maxehrich ??."
Lovato took a trip down memory lane when she rewatched her role as Mitchie in the hit Disney Channel original films Camp Rock and Camp Rock 2: The Final Jam.
Documenting the journey on her Instagram Story, Lovato was heard giggling and mocking some of the franchise's funnier moments. One particularly sweet moment she recorded was her boyfriend's genuine reaction to the shocking ending of Camp Rock 2.
The couple then took their relationship to the next level when Ehrich proposed. Lovato took to Instagram to share a slideshow of snapshots depicting the special moment after Ehrich popped the question on the sands of Malibu beach.
A source told ET that the newly engaged couple was extremely happy and in love. "Obviously the photos show how beautiful the entire proposal was," the source said.
The newly-engaged pair appeared to be more in love than ever. On Aug. 8, Lovato posted a photo of the two kissing, captioning the shot, "Falling more and more in love everyday with you honey 💖."
That same month, Ehrich posted the sweetest birthday message for his fiancee on Aug. 20. "Words fall short baby. you light up this world & i am the luckiest man alive to call you my fiancé. i keep falling more in love with you & your pure heart & soul every moment. can’t wait to make endless memories with u & forever cherish you with all my heart. happy 28th, my angel @ddlovato 💘🎂."
By the end of the month, the pair was "making magic" together.
By September, the two hadn't posted much about each other on their pages. They singer did, however, celebrate their six-month anniversary on Sept. 7 with a video of the actorplaying with puppies.
"Happy 6 months to my darling, the best father these pups could ever ask for... Thank you for making my life so much better @maxehrich," she shared on her Instagram Story. "I love you baby."
Ehrich shared the post on his Instagram Story as well, writing, "Words fall short, baby. Love you infinitely & then some. Thank you for being the light of my life. Cheers to forever."
"It was a tough decision, but Demi and Max have decided to go their separate ways to focus on their respective careers," a source told ET. "They have respect and love for one another and will always cherish the time they spent together."
For more on Lovato and Ehrich's time together, see below.