The 31-year-old star spoke about the recent split in a new clip for the upcoming epsidoe of "Kocktails with Khloe", reported Aceshowbiz.
"He sought me out, he wanted to be committed ...Then wasn't committed," Kardashian said.
Guest Lisa Rinna asked her what happened with the last relationship and she answered, "You know, I just don't want to put up with people that - you want to be monogamous, but then you're not monogamous."
"I'm not into, like, I've always said, you know, it's long distance, it's this or that, I've always said we don't need to be monogamous," said Kardashian.
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"Like, you know, there's a lot going on in both of our lives. You live in Houston, I live in LA, like let's just-let's see each other when we see each other."
Of making commitment, she said, "He wanted that. I was, I mean I wanted it, but I wanted to be realistic. I was like, you know what, it's unfair.
Kardashian did not elaborate on James' infidelity but said in the 2-minute clip she had "the receipts to prove it.