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?

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.