To understand the psychology of relationships, the couples are asked to talk about their pasts. For one person, the stress of this accelerated process leads to a major breakdown. A surprise visitor arrives to the island, which may change the course of one couples' relationship forever.

Halfway through their time on Honeymoon Island, the guys confess to Jona they are worried that Brandin is leading him on. Kimber and Shannon struggle to see eye to eye on a potential relationship deal breaker. After an intense group relay race, one couple's ridiculous fight spins out of control.

The couples turn up the heat during intimacy exercises and while most take their relationship to the next level, Brandin gets a little too friendly with Tyler, causing one couple to go up in flames. Then, one couple leaves Honeymoon Island for good.