Emotions are high--and sparks fly--as the couples part then embark on the ultimate love challenge. Can they pick a new partner, with real potential?

Will attraction evolve into deeper connection? Selecting a live-in match makes for flirty fun--and hurt feelings. Time for a life-changing choice.

One shock follows another as an honest, tearful outburst leaves everyone speechless. Later, the accelerated trial unions kick off with pillow talk.

Love may be blossoming, but jealousy gets in the way. We're moving fast, so meet the racer dad. The truth stings as everyone trades notes over drinks.

After an evening of strained cocktail hours, couples cuddle--and implode. A forbidden meeting ends with drama as short-term spouses push each other.

Major feelings emerge at the changeover. Everyone's back with their original partners, but the transition might be bumpier than anyone ever imagined.

Tears tarnish a bachelorette bash. Longtime loves try to listen and hold on to hope. The couples board the party bus to bond, awkwardly, at a winery.

An all-nighter deals a blow to a fragile relationship. Can bruised feelings be soothed by a temp partner? Family weigh in with love on the line.

Ultimatum Day arrives. Now the couples must decide whether they'll marry the love they know, reconnect with an attractive alternative — or walk away.

Where are they now? Catch up with the couples as they revisit the experience and talk about their lives since the series with Vanessa and Nick.

The couples spend tense and tearful last nights together. Then, jealousy brews as they begin mingling amongst each other to make connections.

For some, the sight of their ex dating others proves too much to bear. After a dramatic confrontation, everyone prepares to choose their live-in partner.

A stunning revelation shifts the group dynamics. Following the choice ceremony, the new couples move in together — there's no going back now.

From picnics and meeting parents to heart-to-heart conversations, the trial marriages continue. Which bonds will flourish, and which will fizzle?

Time to sip and tell: brutal honesty abounds over drinks at ladies and guys night, and as harsh opinions come to light, friction grows.

The fallout from cocktail hour changes several couples' perspectives. Strong words and hard truths are shared during an intense changeover.

Finally reunited, the original couples start a new round of marriages with fresh eyes. But the transition is bumpy — and even bitter — for some.

With only three days of the experiment left, the couples consult with friends and family. Can romantic gestures and deep talks ease lingering doubts?

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After a historic finale, the group reunites with Nick and Vanessa for a heartfelt and heated sit-down about their experience and where they're at now.