A whirlwind proposal leads to a moment of truth, a pivotal ask comes with unclear intentions, and a body image conversation forges a strong connection.

In Mexico, the couples continue taking steps toward the altar... and deal with some not-so-sexy symptoms. At cocktail hour, former flings reconnect.

Happily ever afters or heartbreaking goodbyes? The couples decide as the experiment comes to a close in the company of friends and family.

This season's singles and married couples gather round and get real with Nick and Vanessa, dissecting everything from I do's to I don'ts.

For one woman, the third shot at love might be the charm. Bartise and Nancy both feel torn between two different people. Two more couples get engaged.

Five newly minted pairs of fiancés arrive at a luxurious resort in Mexico, where things go swimmingly for some while others struggle to stay afloat.

The remaining couples weigh doubts and dreams as they decide whether to commit to their futures together — or walk away alone.

The pairs turn to their parents for relationship advice. Emotions run high when the couples reunite with some of their former prospects from the pods.

Walk away or say "I do"? Life-changing decisions await the remaining couples as the big day approaches and pre-wedding festivities kick off.

Poor communication puts two engagements at risk. A text from an old flame ignites drama right before a reunion bash with former podmates.

The pods are now open! Singles try to make love connections through a wall, and a romantic revelation causes a stir in the women's quarters.

Cohabitation leads to tough conversations about cross-country moves, finances and living arrangements. A shocking discovery devastates a bride-to-be.

As the couples deepen their bonds with adventure, relaxation and future planning, a detailed list of grievances strains one rocky relationship.

Loved ones gather while the remaining couples prepare to become husbands and wives. Who will say "I do," and who will leave the experiment alone?

The reunion bash brings closure for some and opens doors for others. Things get real when the brides-to-be try on dresses and future grooms select suits.

With the weddings around the corner, trust issues and cold feet cause turmoil. After an emotional dress fitting, a couple takes their love to new heights.

A shocking event puts three participants in a difficult position. As one pair opens up about their childhoods, another takes their bond to the next level.

Tensions escalate when two participants fall in love with the same person — who must make a tough decision. Another single puts a ring on it.

Vanessa and Nick share a surprise with the group. Kelly and Kenny deal with distance, Jessica meets Mark's roommates, and Amber throws a party.

Things move quickly as a new group makes intense connections in the pods. One couple trades three little words, and then four: "Will you marry me?"

Nancy weighs two proposals and finds clarity. The second phase of the experiment begins as five engaged couples leave the pods and head to Malibu.

The couples settle into real-life time together in Malibu and finally meet each other at a cocktail night, where old feelings cause a few new bumps.

As more couples head to the altar, some finish the day heartbroken while others — despite their doubts — take the plunge and say, "I do."

One excited couple meets face-to-face. A participant works through big emotions. A connection grows deeper between two singles who share similar beliefs.

Cohabitation brings sweet surprises and intense challenges for the couples, while romantic interests from the past create problems in the present.