Five 90 Day couples arrive at a paradise retreat for intensive therapy. Infidelity shakes Kalani and Asuelu's world. Angela threatens divorce. Yara confronts her nemesis. Ed and Liz want to move beyond their breakup cycle. Molly and Kelly try to heal.

A blindfolded obstacle course puts relationships to the test. Angela communicates better with another man than with Michael. Yara reveals a secret she's been keeping from Jovi. Ed gets called out for cheating during a trust-based challenge.

Liz triggers Angela, who ends up having to discuss her anger issues with Dr. Janie. Yara's romantic gesture ends with a drunken debacle. Liz and Ed struggle to communicate. Kalani and Asuelu take a shaky step forward. Molly and Kelly fall into old habits.

Sex therapy exposes the couples' intimate vulnerabilities. Angela and Michael find a new way to enjoy their long distance relationship. Jovi and Yara struggle to get on the same page. Molly and Kelly seem to reach an impasse.

The couples talk about failing and succeeding at their sex therapy homework. Jovi plans a surprising experience for Asuelu. Angela scares Kalani and Yara with what's hidden in her swimsuit. Ed discovers who he was in a past life.