Libi Newman doesn’t date. Relationship and Harm OCD make it tough for Libi to date without doubts, so she prefers to flit between hook-ups instead, knowing that she can’t sabotage a relationship if it’s not serious. It’s not ideal, but grieving her mother’s recent passing, Libi can only deal with so many emotions at once. That’s what OCD support group is for anyway.

Nate Keller has harbored a crush on Libi since she joined the group. While he’s there to discuss his Contamination OCD, he can’t help but be fascinated by Libi's history…and her adorably chatty nature. But they’re just friends, and Nate’s okay with that. Really.

When Libi's summoned to the Newman family timeshare in Mexico for her grandparents’ anniversary, it’s not all margaritas and suntans. Not only has her father started dating a new woman, her least-favorite cousin also has a boyfriend to introduce to the family—shockingly, it’s Libi’s ex, who she might still be in love with… Not wanting her to stomach the reunion alone, Nate tags along for emotional support.

What begins as an innocent promise of friends helping each other quickly turns into a fake-dating scheme. And Nate’s playing the fake boyfriend role too well. As the lies stack up, Libi has to keep up with her own ping-ponging emotions: are the romantic sunset strolls coloring her perspective… or is she actually wanting to date Nate for real?