Rocker John Mayer's on-off relationship with Jennifer Aniston is off again, according to reports.

Mayer ended the romance last week after the former Friends actress returned from a promotional jaunt in Europe to support her latest movie Marley & Me.

A source tells E! Online's Marc Malkin, "He broke up with her when she got
back from her European tour."

The news comes just weeks after the couple gave its first joint red carpet interview at the Oscars, which Mayer attended as Aniston's date.

Reports as recently as this week even suggested Mayer was preparing to propose to the actress after allegedly shopping for an engagement ring.

But Aniston - who divorced husband Brad Pitt in 2005 - recently hinted her romance with Mayer would be short lived, after admitting she doesn't believe relationships are meant to last.

She said, "Who ever said that every relationship has to last forever? That's hoping too much. I think every relationship is a world unto itself."

And when asked about finding the perfect partner, she replied, "I don't have one and I don't think it exists."

The stars were first rumored to be dating in early 2008 but the couple parted ways at the end of last summer. They rekindled their romance in October.

Mayer's spokesperson has declined to address the singer's private life, while Aniston's representative has yet to respond to requests for comment on the reports.

(This news article provided by World Entertainment News Network)