07/11/2014 04:59 pm ET Updated Jul 14, 2014

Khloe Kardashian Admits That Lamar Odom Cheated On Her

Khloe Kardashian wasn't kidding when she said the upcoming episode of "Keeping Up With The Kardashians" would be a "tough" one to watch.

In a teaser clip of Sunday's episode, the 30-year-old reality star admits to sister Kourtney that she knew her now-ex Lamar Odom was cheating on her toward the end of their marriage.

“Do you know the interviews he’s been saying that being married to me were the best years of his life, he’s now wearing his ring full time. F–k your ring. You were wearing it when you were f–king someone too,” Khloe says. “He doesn’t think we are going through with a divorce.”

Things get even more emotional when Khloe, who filed for divorce back in December, describes how difficult it was to hide what was really going on between her and Odom.

“The way I was living is not a way to live. I kept on hiding every time there was something going on. I would have to lie, or conceal, or cover up, and I’m so over it,” she says. “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, OK? And I lied and I gave up my Beyonce tickets to Kendall that’s how badly I was hiding.”

The episode might be opening up old wounds for Khloe, but the reality star has clearly moved on since the split. Just last week, she and boyfriend French Montana made their relationship red carpet official, when the rapper joined the E! star to celebrate her 30th birthday in Las Vegas.

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Khloe Kardashian