Written by Zoë Holloway, September 22, 2016

He seemed so comfortable with the person on the phone. Justin Theroux was laughing and chatting when his wife Jennifer Aniston walked in. After he hung up, she asked who he was talking to-but his reply wasn’t what she wanted to hear.

‘He said he was talking to Heidi,’ an insider tells OK!, referring to Justin’s ex- girlfriend of 14 years, Heidi Bivens.

Heidi Bivens and Justin Theroux attend the "Charlotte Ronson" fashion show at Bryant Park during Mercedes Benz fashion week in New York City. (Photo by Lars Niki/Corbis via Getty Images)

‘They’ve stayed in contact ever since they broke up, and Jen hates it. She let him have it, saying it was the last time she ever wanted to hear about that woman.’

Unfortunately that’s not going to happen. Justin, 45, has no intention of ceasing contact with Heidi – whom he broke up with just days before going public with Jen, 47, in 2011 – even though it is putting a huge strain on his already shaky marriage.

‘Justin and Heidi are friends and that’s not going to change,’ says the mole. Jen caught him on the phone with the stunning 40-year-old stylist and costume designer when he returned home to LA from Australia – where he had been shooting his drama series The Leftovers – in August to celebrate their first anniversary.

‘It should have been a happy time for them,’ says the insider. ‘But instead, their anniversary was a dud and then they had the fight over Heidi. By the end of his trip they were barely speaking to each other,’

Adds a friend of Jen’s, ‘when Justin walked out on her to return to Australia, they were split.’ Justin doesn’t think he is doing anything wrong. After all he married Jen, not Heidi, and he’s been upfront with his wife about maintaining a civil friendship with his ex over the years. ‘He’s even let Jen read their text messages- He gave Heidi business advice and the messages were work-related,’ says a source.

‘Jen was devastated,’ she couldn’t believe Justin would do this to her,’

‘He wanted to prove there’s nothing untoward about their communications, but Jen flies off the handle and says he’s obsessed with Heidi. Justin told Jen that he won’t just ignore Heidi.’ That’s not what Jen wants to hear. ‘Jennifer considers it a complete betrayal,’ says the pal.

NEW YORK, NY - FEBRUARY 15:  Heidi Bivens and actor Justin Theroux attend the Rodarte Fall 2011 fashion show during Mercedes-Benz Fashion Week at Private Studio on February 15, 2011 in New York City.  (Photo by Joe Kohen/WireImage)

Justin and Heidi have a very strong bond. They spent 14 years together and shared an apartment, as well as friends, back in New York until he hooked up with Jen after they co-starred in Wonderland. And unlike many jilted Hollywood exes, Heidi never spoke out about her heartache or publicly lashed out at Justin or his wife.

‘He considers Heidi a close friend, despite her hurt feelings when he took up with Jennifer,’ says Jen’s pal. The insider also said it irks Jen that Justin ‘will still consult Heidi’ – who influenced his trademark urban biker look as they both established their Hollywood careers – because he considers her his style guru.

Justin has a lot of respect for his exes’ professional talents. ‘He thinks Heidi is a great and original costumer and stylist, and always has nice stuff to say about her work to people in the industry,’ says the insider. The whole thing leaves Jen feeling insecure. ‘She believes Justin’s good word recently landed Heidi a job on big-budget feature film, even though its more likely that Heidi got the gig due to her own talent and connections.’ Heidi’s worked for fashion magazines including Details, and Vogue, styled videos for artists including Kanye West and The White Stripes, and served as the costume designer on such films as Spring Breakers and Inland Empire.

Trust has always been a big problem for Jen. ‘She still harbors trust issues from her past relationships, including her broken marriage to Brad Pitt,’ says the source. After Brad and Jen’s 2005 divorce, he and Angelina Jolie admitted they’d fallen in love on the set of Mr and Mrs Smith in 2004, while Brad was still married to Jen.

‘Jen’s told pals she lives in constant fear that Justin is going to run off with another woman and leave her broken hearted like Brad did.’ Or maybe, says Jen’s friend, there’s some ‘karmic guilt’ there, since she was accused of stealing Justin away from Heidi. It doesn’t help that Justine works with some beautiful-and much younger-women.

NEW YORK, NY - JUNE 24:  Jennifer Aniston and Justin Theroux seen on the streets of Manhattan on June 24, 2016 in New York City.  (Photo by James Devaney/GC Images)

‘Jens always been jealous of his The Leftovers co-stars, especially 21-year-old Margaret Qualley,’ says her pal. At HBO’s Emmy after party in 2015, a witness spilled that Justin and Margaret, who plays his daughter,’ were very flirtatious’. And though it could’ve just been an older-man crush on Margaret’s part, Justine was…feeding into it’.

Problems in Jen and Justin’s marriage are nothing new. ‘They’ve had long periods of separation, and Justin doesn’t seem to want to settle into life as a married man,’ reveals Jen’s friend.

Adds the insider ‘Jen has beginning to resent the way Justin hasn’t been present.’ Jen appeared solo at a screening of her new movie Storks in LA on September 17.

After living apart for almost three long months while Justin was down under, production is wrapping up and he’s coming home. But he is walking into a storm of serious issues, ‘Justin and Jen are going to be together again, but there’s been no resolution to the Heidi situation or the fact that he and Jen have been living separate lives,’ says Jen’s friend.’ This is make-or-break time for the relationship – and sadly, it’s not looking good’.

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