RHOBH: What is "the unspoken thing"?

Separation and divorce has been a major focus of the latest season of The Real Housewives of Beverly Hills with both Kyle Richards and her former best friend Dorit Kemsley going through their own respective separations. Despite the fact that the two of them are going through similar things in their marriage, Kyle and Dorit are far from seeing eye-to-eye and it seems like each episode just shows the two of them falling farther apart in their friendship.

In the preview for the January 14 episode of RHOBH, the drama heated up when Kyle Richards spoke to Sutton Stracke and Garcelle Beauvais who mentioned "the unspoken thing" that happened in Kyle Richards' separation that sets it apart from Dorit Kemsley's.

Did Mauricio Umansky cheat on Kyle Richards?

Rumors about infidelity in Kyle Richards and Mauricio Umansky's marriage is nothing new. Although the rumors have been persistent through most of the show, the most recent incident took place during The Real Housewives of Beverly Hills will remember season 13's reunion when Kyle Richards shocked fans by sharing that something happened in their marriage.

Although Kyle Richards didn't specificy what that something was, she did say that she "lost [her] trust" in Mauricio Umansky, which many fans took to mean that he had cheated on her, though she didn't get specific about the incident.

Now, in the preview for the January 14 episode of RHOBH, Sutton Stracke is bringing those infidelity rumors back to the forefront -- by directly claiming that Mauricio cheated on Kyle.

In the preview, Kyle is talking with her co-stars Garcelle and Sutton about the fact that Dorit Kemsley was upset with her for texting Dorit's estranged husband, PK. Garcelle and Kyle are discussing whether or not it was right for Dorit to be upset and whether or not Kyle would react that way if the tables were turned.

According to Kyle, her own separation is a "different situation" from Dorit's, so they can't be compared. To this, Garcelle says that their situations are pretty similar, minus the infidelity, and Sutton interjects that Kyle did have infidelity in her own marriage, seemingly confirming the long-running rumors that Mauricio Umansky had, at some point, cheated on Kyle Richards.

"This is definitely the unspoken thing, no one brings that up. I mean, listen, we've been hearing rumors for years that either Mo has stepped out or he's doing this or he's doing that. Nobody has confirmation, but it's been all over," Garcelle said in a confessional about the persistent rumors surrounding Kyle and Mauricio's relationship.

While Kyle Richards denied that there had ever been any infidelity in their relationship and asked if Sutton was referring to the fact that the two of them had previously gotten into arguments over flirty comments on Instagram, which Kyle Richards has previously opened up about on the show, but Sutton Stracke told a producer that's not the infidelity she meant.

Tune into Bravo tonight and every Tuesday at 8/7c to see the drama unfold on The Real Housewives of Beverly Hills.