Some of the couples find difficulty letting go of their past, which strains their new arrangements.

When family members weigh in, couples face tough truths. A surprise twist at a group gathering sends shockwaves, testing every union.

As the experiment draws to a close, heartfelt moments contrast with tense confrontations, leaving several couples with tough choices to make.

Reunited with their original partners, couples sift through their experiences and consider their futures together.

Time is almost up for the couples, whose reflections on the nature of love and commitment raise questions about their relationships' viability.

The moment of truth is here. Participants make profound choices about love, commitment and their futures.

After the experiment, the participants reflect on their lives, relationships, heartbreak and healing in an emotional reunion.