Jen and John off again?

Jennifer Aniston and John Mayer have reportedly split up. Again.

The pair have been in an on/off relationship since May 2008, with recent reports claiming they are planning to marry.

It was claimed this week that Mayer had approached top US jeweller Lorraine Schwartz about making a custom engagement ring for the Former Friends star.

However, according to People, they are said to have ended their relationship when the 40-year-old actress returned home from Europe, where she was promoting her movie Marley & Me.

"They had some disagreements and decided to not continue to see each other," said a source. "Jen is moving on with her life like she always does. She seems happy."

Despite splitting in 2008, the pair have been spotted in each other's company frequently in the last few months and recently attended the 2009 Oscars together.

Jennifer recently said she hopes to be "good friends again" with ex-husband Brad Pitt.

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