After a month and a half, the former Disney star ended her relationship with the actor.
Before the news broke out, Lovato had already set fire by tweeting a mysterious message: “The smartest thing a woman can ever learn, is to never need a man.”
The message appeared after she retweeted a Marilyn Monroe quote posted by a follower that read, “A wise girl kisses but doesn’t love, listens but doesn’t believe, and leaves before she is left.”
Having already broken twice , the couple reunited in late 2011.
Lovato, 19, and Valderrama, 31, never officially confirmed their relationship but they were seen kissing on multiple occasions, including once last November Valderrama’s home in Los Angeles.
They also attended Tiffany Thornton’s wedding together last year.
Demi Lovato will be performing tonight at the People’s Choice Awards.