Tom Sandoval is apparently “addicted” to Raquel Leviss, his best friend, Tom Schwartz, revealed.

“Raquel is Tom’s heroin,” Schwartz told Andy Cohen during Wednesday night’s episode of “Watch What Happens Live.”

Schwartz went on to claim that, because his BFF has ADHD, he “became obsessed” with Leviss.

“He’s addicted,” the “Vanderpump Rules” star added. “It’s an infatuation of infatuations.”

Schwartz emphasized that he didn’t intend to “minimize” or “disrespect” people battling with addictions, but his buddy got “lost in the sauce” — and still is.

The Bravolebrity went on to claim that Sandoval and Leviss’ affair started when they had a one-night stand in August 2022. It then evolved into an “emotional affair” in the fall.

By January 2023, Sandoval confided in Schwartz that his relationship with Leviss had “steadily progressed” and that he was “in love” with her.

“I was flabbergasted, but I’m not surprised because I think there’s a lot of people out there who knew it was an open secret,” Schwartz claimed.

Schwartz’s confession comes one month after Ariana Madix dumped Sandoval when she discovered a sexually explicit video of Leviss, 28, on his phone.

Madix and the bar owner had been dating for almost 10 years and even owned a home — where they still live together to this day.

A few days after Scandoval was exposed, paps caught up with Schwartz while jetting out of LAX, where he revealed his initial thoughts about the affair.

“He’s OK, I think. Relatively speaking. I mean, he has a sense of profound sadness, rightfully so. I think he feels like a piece of s–t, and to some extent, maybe he is,” Schwartz, 40, told TMZ.

“But he knows he f–ked up. The whole thing is just really sad.”

At the time, however, he refused to confirm whether he knew about the secret tryst, which started back in July 2022.

“Vanderpump Rules” airs Wednesdays at 9 p.m. ET on Bravo.