Glanville, a former cast member on “The Real Housewives of Beverly Hills,” appeared on Wednesday’s episode to say that she and Richards had a tryst that left her feeling disgusted and vulnerable.

The “Drinking and Tweeting” author, 47, said she and Richards, 48 — who is married to Aaron Phypers — “hit it off right away” when they first met but Richards “kind of put me in a situation where I was the cheater.” She then explained that cheating is a sensitive topic for her after ex-husband Eddie Cibrian infamously had affairs behind her back.

“I had been out with her and Aaron and like, I knew that they have an understanding,” Glanville began. “Like, she could be with girls if she wanted to. And as long as, you know, it wasn’t with a guy. The first night we met, something happened.”

Denise and Phypers tied the knot in September 2019 in front of “RHOBH” cameras.

“Denise and I went out and we had dinner,” Glanville explained as a flashback to a dinner scene between her and Denise played out.

The scene then cut between her talking to the women and her talking in a confessional saying: “We completely click. We get absolutely wasted. We go to the restroom and all of a sudden we’re making out. But she wasn’t with, like, Aaron at that time.”

“I was not expecting it,” she said in a confessional. “I was like, I’ll go with it. I’m wasted. You’re pretty. Let’s do this.”

Then, Glanville said, in April of last year “she invited me to go to her set in Northern California to do my podcast. She really wanted to hang out a lot. And she’s like, ‘Just come here’ and I was like, ‘OK. I’ll just go there.’ I went and I was going to get my room. But Denise said, ‘No, just stay here. It’s fine. I’ll get you like a rollaway bed. You can stay in the room with us. There’s plenty of room.’ Her middle daughter was there with a friend and we did the podcast. That first night the girls were sleeping in a room downstairs a the door and Denise had a room upstairs. There was no rollaway bed conveniently. And so I just slept in the bed with Denise.”

She said that nothing happened between them that first night, but the second night, “We got really drunk and we were just so f–ked up and — just like, we kind of hooked up. We hooked up.”

Cast member Teddi Mellencamp then asked if they just kissed, to which Glanville replied that they did “everything.”

Glanville added to the cameras that she is bisexual and open about it.

“I was uncomfortable,” she continued with her story. “The kids were downstairs and we were in the loft and there was no door. And I just couldn’t get into it. And the next day she just said to me, she’s like, ‘No matter what you do, you can’t tell Aaron. He will kill me.’”

“I’m like, ‘What the f—k is happening right now?’” she added.

In a confessional, she explained, “In the moment I was just like, I’m everything that I have always hated because my books are both about hating cheaters, not being cheaters, being loyal. I will never be the other woman. I would have never slept with Denise if I thought that Aaron was not OK with it. And he knew I was going out of town with her. He knew we’d made out before. There was no question in my mind that Aaron was OK with all of this.”

Denise denied in February that she and Phypers had an open marriage.

Cast member Kyle then asked what happened after she and Denise had their alleged rendezvous.

“It was kind of like I never really existed,” Glanville said. “But then she would text me and stay in touch to make sure that everything was kosher. I never wanted to see her in that way again. She made me believe that I did something wrong.

Rumors of Glanville and Denise’s affair began circulating in January, as Denise stopped filming with the rest of her cast following their confrontation during their cast trip in Rome.

Adding fuel to the fire, last month Glanville tweeted a photo of herself kissing a woman who appeared to be Denise.