Tom Sandoval, Raquel Leviss alleged affair had been going on for 6 months

New details have emerged in the wake of Tom Sandoval and Ariana Madix's break up.

TMZ reported Friday that the Vanderpump Rules co-stars had split after Madix caught Sandoval cheating with their co-star Raquel Leviss.

"This has been going on for upwards of 6 months — all the while, Tom was sleeping next to Ariana in bed," a source dished to People about Tom’s infidelity. "She was completely blindsided by this; devastated doesn't even scratch the surface of how she feels."

"This is someone she thought she knew; someone she planned to spend the rest of her life with. You can't even put into words that betrayal," the source added.

The news of the pair’s split after they made their last public appearance together at the 38-year-old singer’s band performance earlier this week.

The insider noted that Madix was “supporting [Sandoval’s] new single” before she caught him cheating.

"She had no idea any of this was happening behind her back," they shared.

Previously, Raquel had gushed about exchanging texts with Sandoval in an interview at Virtual Reali-tea.

According to the media outlet, Madix learned about the pair’s alleged affair after going through their history of inappropriate texts.