Kim Kardashian's younger sister filed for divorce from the embattled basketball player in December (13) after longrunning speculation suggesting he had been battling addiction issues and had been unfaithful to his wife.
Khloe denied the multiple tabloid reports in the months leading up to the court filing, but now she is finally opening up about what drove her to end the four-year marriage.
In preview footage for her family reality show Keeping Up With the Kardashians, Khloe reveals she was well aware of his infidelity and even had to spend her 29th birthday in June, 2013 alone.
Confirming the rumours for the first time, she tells her sister Kourtney, "The way I was living is not a way to live! I kept in hiding every time there was something going on. I would have to lie, or conceal, or cover up, and I'm so over it!
"Let me tell you something. Last year on my birthday I lied to everyone because I had to lie and say I was with my husband when in fact my husband was messing with another girl... I was alone and lied to everyone."
Khloe has since moved on from her broken marriage and celebrated her 30th birthday last month (Jun14) with her new boyfriend, rapper French Montana.
The Keeping Up With the Kardashians episode in question is due to air in America on Sunday (13Jul14).