(Cover) - EN Showbiz - Demi Lovato has hinted that she has split from her boyfriend.

The 19-year-old was rumoured to have reconciled with ex-boyfriend Wilmer Valderrama after they were seen kissing in public late last year.

But now the Skyscraper singer appears to have had a change of heart regarding the opposite sex, detailed in a series of posts on Twitter about relationships.

"The smartest thing a woman can ever learn, is to never need a man," she wrote on the social networking site.

She had earlier posted a quote by Marilyn Monroe.

"A wise girl kisses but doesn't love, listens but doesn't believe, and leaves before she is left," Demi wrote.

The starlet and the 31-year-old actor were reportedly out together over the weekend.

But the former Disney star has recently been tweeting about "loyalty" and thanking her "friends who stand by my side" leading to suggestion that the pair may have split. (C) Cover Media