It looks as though there's a good reason why Jennifer Aniston and Justin Theroux haven't tied the knot just yet, despite being engaged for over two years now. New reports suggest that Aniston has been having a hard time convincing Theroux that they need couple's therapy, as she's worried that they might never make it to the alter.

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According to OK! Magazine on Tuesday, Theroux is fed up with Aniston's insistence on working out their each and every problem with a therapist.

A source tells the site, "Justin's tired of overanalyzing everything. He feels like he can't relax, because if he says something wrong, he'll get called out for it in therapy."

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Despite the issues she faces in her personal life, Aniston recently said she's not worried about her future.

According to a new interview with the Belfast Telegraph earlier this month, Aniston reveals that the key to staying happy is to not worry about tomorrow.

She said, "Proper sleep, exercise, vitamin B12 shots. Also it's not looking into the future and seeing what lays ahead, like: 'Oh my god, how am I going to do this? Are we going to get on the plane, do we sleep, do we not sleep? We land so late in the afternoon, and then when we do go back and think about the morning?' And a dry martini helps!"

Aniston and Theroux have been engaged since August 2012.

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Jennifer Aniston, Justin Theroux