“90 Day Fiancé” Season 12 star Catie brazenly cheated on Josh multiple times just months after the two got married.

Catie’s shocking transgressions are revealed on the first part of this season’s tell-all, which aired Sunday on TLC. While Catie has a history of making out with multiple people when she’s drunk — and blaming it on having obsessive compulsive disorder (OCD) — she promised in the finale that she would be faithful to Josh after tying the knot.

But that definitely hasn’t been the case. Catie has a breakdown multiple times during the tell-all, specifically when she’s confronted about her concerning behavior.

“On New Year’s Eve, I was bad,” she admits, smiling as she says she made out with four other people.

As she continues to laugh, her fellow cast-mates sit silently, seemingly showing their disapproval.

Josh says he’s “disappointed” in Catie “crossing boundaries,” and when Edward notes that he’s too nice, Catie bites back that her husband’s “not that nice.” When host Shaun Robinson asks her if she thinks her partying is the problem, she bursts into tears.

“Everyone thinks I’m a bad person,” she sobs. “I don’t like this.”

“I’ve been trying to get better,” she insists.

But Catie continues to awkwardly laugh as they play back cringe-worthy video of her this season aggressively trying to make out with her friends in front of Josh. When Josh confronts her about her cavalier attitude, she says she’s “stress laughing.”

Later, the extent of her cheating gets exposed after producers bring in her friends Ryan and Danica to comment on Catie and Josh’s marriage. Danica recalls that Josh and Catie had a rooftop party on New Year’s Eve, and Catie invited her “crush” from her run club and made out with him twice — once in plain view of Josh — until she cut her off.

Danica recalls that Catie, 26, then chugged a bottle of champagne, and she saw her make out with two more people that night, including an older man named Robert who is in his 50s.

Josh, 30, says he actually had to intervene when he saw Catie going into the bathroom with the first guy she made out with, and asked him to leave. Catie admits she doesn’t know how far she would have gone with the guy if Josh didn’t stop them, and says it’s possible it would have went past kissing.

At this point, Catie has an unexpected outburst, defiantly telling Josh, “I can do whatever I want. I don’t have to listen to you!”

“I just want to be young and just live my life,” she adds.

When her castmates ask her if she even wants to be married, she bursts into tears and yells, “I don’t know!”

“I don’t enjoy being together, sorry,” she tells Josh. “I think I do better on my own.”

Catie walks out of the tell-all and continues to sob as a producer comforts her backstage.

“I don’t care if I make out with people, it’s fine,” she says. “I don’t want to talk to any of them ever again.”

“90 Day Fiancé” airs Sundays at 8 p.m. ET/PT on TLC.