Khloe Kardashian has accused her ex-boyfriend, basketball ace James Harden, of cheating on her after pressuring the reality star to commit to an exclusive relationship.

Kim Kardashian's younger sister recently split from the Houston Rockets player after embarking on a romance last July (15).

Now the Keeping Up With the Kardashians beauty has opened up about the failed relationship after she was quizzed about her love life by actress Lisa Rinna during a Los Angeles taping of her Kocktails with Khloe talk show.

During the candid chat, which will air on Wednesday (24Feb16), Khloe claimed James broke his own vow of monogamy.

"I don't want to put up with people that you want to be monogamous, but then you're not monogamous," she explained. "I've always said, 'It's long distance, we don't need to be monogamous. There's a lot of s**t going on in both of our lives; you live in Houston, I live in L.A... Let's just see each other when we see each other'."

However, James reportedly rejected the idea and instead pleaded with Khloe to commit herself to the romance.

"Why wouldn't you say, 'OK, that's great,'" she questioned. "Instead (of) forcing a relationship. 'Let's be committed, let's be committed', he wanted that. I mean, I wanted it but I wanted to be realistic. I was like, 'It's unfair, I'm working so much right now... You're in Houston... We don't need to be committed.'

"He sought me out, he wanted to be committed... then wasn't committed."

Khloe goes on to insist she has evidence to prove James was unfaithful.

"I was like, 'Great, this guy is in it for the long haul, let's do it', and then I found out he wasn't," she added. "And I have the receipts to prove it!"

The 31-year-old's relationship with James was further complicated by drama surrounding Khloe's estranged husband, former sportsman Lamar Odom, who was found unconscious after collapsing due to a drug overdose at a Nevada brothel in October (15). Khloe, who previously also dated rapper French Montana, flew to be by Lamar's side and has continued to aid in his recovery process.