Brad Pitt and Jennifer Aniston
Brad Pitt and Jennifer Aniston did not vacation together in Cabo San Lucas, Mexico. Pictured: Aniston and Pitt at the premiere of "Rock Star" at the Mann Village Theater in Los Angeles on Sept. 4, 2001. Getty Images/Kevin Winter

Jennifer Aniston’s second ex-husband Justin Theroux got insecure with Brad Pitt due to a certain incident.

The “Friends” alum was married to Pitt from 2000 to 2005. Their fans were heartbroken when they decided to end their marriage. In 2015, Aniston married Theroux, but their relationship after they wed only lasted for two years.

According to an insider, Theroux found the love notes Pitt wrote to Aniston which she had saved. Those notes were written on Post-its and were very sweet and it gave a glimpse of Pitt and Aniston’s relationship when they were still together.

“He stumbled upon old Post-it notes Brad had written,” an insider told Us Weekly. “Sweet little Post-its like, ‘You looked nice tonight’ or ‘Miss you already.’”

“The Leftovers” actor wasn’t very happy when he found them. Aniston had to assure him that those notes didn’t matter anymore.

“Jen assured him they weren’t a big deal, but Justin wasn’t thrilled … Justin had moments of insecurity like that,” the insider added.

Meanwhile, Aniston was reportedly hurt when she was asked about Pitt and Angelina Jolie’s rumored pregnancy. Following Aniston and Pitt’s separation, the “Ad Astra” actor dated and eventually married the “Maleficent” actress.

According to Leslie Bennetts, who did a tell-all interview with Aniston in 2006, when she asked the “Horrible Bosses” star about Pitt and Jolie’s rumored pregnancy, she looked as if she was stabbed in her heart. Aniston’s eyes welled up and the tears kept rolling down her cheeks. She bit her lips and was unable to speak until she shook her head. The subject was “too excruciating” for her to discuss.

Pitt and Jolie announced their split in 2016. Now that Pitt and Aniston are both single after their separation from their second spouses, fans are hoping that they could get back together.

An insider claimed that Pitt’s friend George Clooney also wanted the exes to reconcile. The “Money Monster” star reportedly arranged a private villa for the pair in Rome. Brad was also keen to reunite with Aniston and was reportedly putting all the hard work to convince her that she can trust him again.