The socialite split from the basketball player last month, filing for divorce just 72 days after the couple's lavish televised wedding.
Kardashian has kept her feelings largely out of the spotlight since the split, but in a new episode of family reality TV show Kourtney and Kim Take New York, she is seen sobbing as she talks about her marriage.
Speaking to her sister Kourtney, Kim cries uncontrollably as she says, "He fell in love with me and I fell in love with him and now my feelings have changed... And I failed at this. You don't think I feel bad?"
Another scene shows the brunette beauty embroiled in a tense discussion with Humphries as they talk about whether to live in his home state of Minnesota.
Kardashian says, "How am I going to have my career and live in Minnesota?" while the sportsman replies, "Maybe by the time you have kids, no one will probably care about you."
The season four premiere of Kourtney & Kim Take New York airs on Sunday.