Are Demi Lovato and Wilmer Valderrama Done Secretly Dating?

Well, it was weird while it lasted.

On-the-DL couple Demi Lovato and Wilmer Valderrama have parted ways, a source confirms to E! News.

Lovato's rep has always been—and continues to be—mum on the subject, but we're hearing that the age gap (she's 19, he's 31) just proved uncrossable for the duo.

Meanwhile, though she never officially admitted to dating her longtime friend, Lovato did post a couple of suspect tweets today...

First, she retweeted another girl's tweet, a Marilyn Monroe quotation reading, "A wise girl kisses but doesn't love, listens but doesn't believe, and leaves before she is left."

Then Lovato added herself, "The smartest thing a woman can ever learn, is to never need a man."

News of the split—not to mention the cryptic tweets—comes after Valderrama randomly added Lovato's ex, Joe Jonas, to his inner circle. The duo spent New Year's weekend in Vegas partying together, and then the following Saturday night they were both at Beacher's Madhouse revue in Hollywood, though Jonas made himself scarce once Lovato showed up at around 1:30 a.m.

Valderrama's shoulder was said to be the one she cried on in the wake of her split from Jonas back in 2010.