Jennifer Aniston and John Mayer
Mark Davis/Getty; Dimitrios Kambouris/WireImage
11/03/2008 AT 01:25 PM EST
When Jennifer Aniston
and John Mayer broke up in August
, Mayer told reporters, "I ended a relationship to be alone, because I don't want to waste somebody's time if something's not right." But the pair reunited in October and have been going strong ever since, sharing cozy dinner dates
and attending concerts. Most recently, the off-again, on-again pair checked out singer-songwriter Ray LaMontagne at Los Angeles' Wiltern Theater, and were spotted hanging out backstage after the gig. A source says that the two "are serious" but acted "very low key" with each other.
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