It's unclear what changed between the once-solid pair, but it appears things took a turn for the worse upon the family's return from their trip to the Bahamas. According to the

It's unclear what changed between the once-solid pair, but it appears things took a turn for the worse upon the family's return from their trip to the Bahamas. According to the third source, "everything was amicable" between Kristin and Jay until he "blindsided" her with his request for a divorce.

Before this saga kicked off, the source says Kristin and Jay were "staying in the house three days on and three days off," so the kids could stay at their home. Now, the same insider says the reality star and retired pro-footballer are "on edge" and are both living in "separate parts" of their Nashville home.

As fans of Kristin know, she and Jay put their romance on full display on the on the E! reality series, Very Cavallari. On the show, the famous duo appeared to have issues but none that caused fans to suspect a divorce was in their future. In fact, in one episode, Cutler toasted his wife, "To Kristin—thank you for making our relationship better and better each and every day. She doesn't settle for anything less. So thank you!"

E! News has reached out to their reps for comment.