Jennifer Aniston still got cold feet when it comes to marriage

Jennifer Aniston's failed marriage to Brad Pitt still haunted her. She got cold feet when it was time to married Justin.

One source said, "Jen panicked and was a runaway bride! Then she tried to blame Justin, by saying he was putting too much pressure on her...
she suddenly told Justin that she just couldn't get everything together in time for the wedding and had to postpone...[Justin] thinks Jen is
terrified because of her failed marriage to Brad Pitt, and he isn't convinced she's fully worked through her grief and sense of failure."

Source