Socialite and reality television star Khloe Kardashian admits in a new episode of Keeping Up with the Kardashians that she knew her then-husband Lamar Odom was cheating on her instead of spending time with her and her family on her birthday last year.

She also revealed that she lied to her entire family, attempting to cover up the fact that Odom was involved with someone else on her birthday. In an effort to keep up the cover, Khloe spent her last birthday by herself. Her family, as seen on their hit reality show, is very close. This kind of betrayal was highlighted in a teaser clip from an upcoming episode of Keeping Up with the Kardashians.

Khloe’s admission of Lamar Odom’s cheating offers more insight into their tumultuous breakup. Previously, some fans disclosed their confusion about the breakup over social media, arguing that Odom was still a member of the Kardashian family. Without the confirmation of Odom’s infidelity, fans weren’t given a complete picture of their breakup.

The revelation also provides a stark contrast to the differences between Khloe Kardashian’s soured relationship with Lamar Odom and her budding relationship with new boyfriend French Montana. Instead of spending her birthday alone, Khloe spent her most recent birthday with her whole family and boyfriend, French Montana. She celebrated with expensive gifts, including jewelry and a new vehicle.