While Kristen and Luke reminisce over their Hawaiian engagement, the argument between the Bookos and the Capernas threatens to derail happier memories. Jesse gets called to task by Andy. Zack, in an effort to make peace within the friend group, extends an olive branch to Janet.

Jax opens up about his sobriety journey and continues to butt heads with Brittany over his actions last summer. Jesse attempts to make peace with his soon-to-be ex-wife before Michelle revisits a long-rumored truth. Tensions come to an explosive head between the Bookos and the Capernas.

As the cast reunites for their first-ever reunion, Kristen and Nia, now both eight months pregnant, relive their fertility journeys. Jesse and Michelle clash over the details of their impending divorce. When the topic of conversation turns to what contributed to the demise of Jax and Brittany's marriage, Jax gets put in the hot seat.

Jesse and Michelle experience a breakthrough in their relationship. Kristen comes to terms with her fertility journey. Conflict takes the spotlight at Michelle's Zen party. The group struggles to make peace with overdrinking accusations, ongoing feuds and a perceived lack of support. Jax comes clean about his battles.

In the wake of the cruise from hell, Janet struggles with insults Kristen threw at her. Danny and Nia look at a house as they get closer to their decision on having a fourth child. Jax and Brittany have an explosive argument when they meet to discuss co-parenting.

Jax spoils Kristen and Luke's engagement after Brittany inadvertently reveals the news to him. Kristen and Zack are fed up with Brittany always choosing Janet over them. All hell breaks loose on a sunset cruise when Janet and Kristen reach their breaking points.

Unbeknownst to Kristen, a fishing trip Luke planned is where he plans to pop the question. Brittany feels hurt and left out when she learns she isn't a part of Kristen's proposal. Janet threatens to leave the trip early when she finds out it was all a cover for Luke and Kristen.

Luke finalizes plans for a group trip to Hawaii where he plans to propose to Kristen. Janet, Michelle, Kristen and Nia butt heads during a girl's night out. Britt sees Jax for the first time since he was served divorce papers. Jesse confronts Aaron about the timeline of his relationship with Michelle.

Jax becomes upset when he finds out about the party at Britt's; the guys take Jax to a dinner that leads to a confrontation between Jason and Danny; the tension between Nia and Janet comes to a head; Jax is blindsided by a special delivery.

Kristen and Luke's housewarming takes a turn; Brittany prepares for Jax's return by meeting with a divorce attorney; Jasmine and Melissa try to mend things with Jason and Janet; Danny is accused of overindulging again.

Tensions boil between Jasmine, Janet and Jason during a beach outing; Zack starts to realize that his friendship with Brittany has shifted; the rumor Kristen started continues to wreak havoc in the friend group.

Jason confronts Danny about his drinking as Danny looks to make amends with Jasmine and Melissa; Kristen attempts to defend the Bookos and in the process, a rumor about the Capernas emerges.

The Santa Barbara trip comes to a dramatic end as Nia fights back against Brittany, Jasmine and Janet; back in L.A., Jesse seeks guidance as he hopes to rebound from his wine country fight with Michelle.

The group's Santa Barbara retreat continues to unravel; emotions escalate between Jesse and Michelle leading to an explosive argument; Nia is blindsided when Zack tells her that some of the group has been talking behind her back.

Jesse and Kristen arrange a getaway to Santa Barbara hoping everyone can find peace and heal; Zack and Janet sit down for a heart-to-heart conversation; Jax, still struggling with his emotions, makes his presence felt in Santa Barbara.

Michelle and Jesse's divorce takes an ugly turn when a rumor about Michelle begins to spread; Brittany tries to put the pieces of her life back together after Jax checks into a mental health facility; Luke reveals a major life milestone to Danny.

Jax's life comes under tough scrutiny as he's confronted about his recent behavior; he finally admits he's at rock bottom and elects to seek professional help; Zack tries to find stability in his friendship with Brittany.

As summer approaches, tensions are on the rise in the Valley; Jax and Brittany continue picking up the pieces from their separation; Jesse and Michelle juggle co-parenting their daughter, Isabella, while starting new relationships.