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By Sierra Marquina

Khloe Kardashian is on the mend after separating from husband Lamar Odom, but in Sunday’s upcoming episode of Keeping Up with the Kardashians, the reality star is having to face the difficult decision.

The 29-year-old reality star sits down with sisters Kourtney and Kim Kardashian and breaks down about making the decision to end things with her husband of four years. (In December, Khloe finally filed for divorce.)

“This was going back several months now,” E! News‘ Ken Baker tells us. “If you look back to that time in Khloe’s life, this was so hard … and she struggled with this privately before anyone knew publicly about the problems they were having … she’d been beating herself up over this and trying so hard and what we are seeing on Sunday’s show is the end of a really long process of trying to make it work.”

Ken, who is close with the family, adds that Khloe is now in great spirits and getting better everyday.

Catch the midseason finale of Keeping Up With the Kardashians on E! Sunday at 9/8c.