It looks as though Jennifer Aniston and Justin Theroux might not be walking down the aisle anytime soon. According to new reports, Theroux is showing signs of cold feet as friends close to the couple say that he is a "commitment-phobe" who doesn't want to settle down with Aniston.

Jennifer Aniston, Justin Theroux Put Their Wedding On Hold Again?

According to Cover Media on Monday, Aniston's friends are concerned that the actress is wasting her time with Theroux, as he isn't showing any signs that he is interested in tying the knot with the 45-year-old actress.

A source told Grazia Magazine's print edition, "Several of Jen's friends, including Chelsea Handler and Demi Moore, are though to have urged caution over Justin's reluctance to carry out the wedding, pointing out his reputation as a huge commitment-phobe. Even Justin's own friends have joked that his like 'we're not on anyone else's time frame' should be 'we're not on any time frame.'"

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What's more, Theroux is supposedly mimicking the same behavior he did when he was in a 14-year relationship with his ex-girlfriend, Heidi Bivens, who he refused to marry as well.

The insider added, "One moment Justin would be dropping hints to Heidi about 'when we're married,' before getting really vague and ultimately dismissing it as just a piece of paper. Justin seems hesitant to even discuss the kind of ceremony he'd like [with Jen]. Their recent trip to Bora Bora was a typical example - it seems Jen wanted the beautiful setting to inspire them to talk about romantic wedding locations, but it seems Justin has become a pro at deflecting her hints."

Aniston and Theroux have been engaged since August 2012.