Khloé Kardashian was worried for Lamar Odom after he quit his therapy early.

The 32-year-old 'Keeping up With the Kardashians' star - who split from the 36-year-old basketball player in 2013 - was ''so stressed out'' during her recent trip to Cuba with her family after she received a call about Lamar who ''asked for cash'' and threatened to run away.

Speaking on the hit E! show about her concern for Lamar, she said: ''Lamar has come a long way since his whole hospital situation.

''But he didn't finish his therapy to get better.''

The former 'Kocktails with Khloé' host has revealed she has not felt she has been able to move on from Lamar since his overdose at a brothel in Nevada last year.

She explained: ''I've put my life on hold to get him on the right track ... but there's so much he has to fix for himself.''

The television personality's fears for Lamar continued to interfere with her holiday, and Khloé had to opt out of accompanying the Kardashian gang on a trip to an art studio because her mind was elsewhere.

She said: ''I'm trying to make an effort to be in the moment ... but being unreachable is an unsettling feeling.''

Khloé's older sister Kim Kardashian West, 35, wants her younger sibling to try and put herself first instead.

The mother of two - who has three-year-old daughter North and seven-month-old son Saint with her rapper husband Kanye West - said: ''It's really hard to see Khloé so stressed out I wish she wouldn't put that whole weigh on her shoulders.

''I wish she would just enjoy herself and not put herself through that.

''I just want her to, like, live life and enjoy herself and not worry about it all, which just breaks my heart because it's, like, the same cycle over again. It just really sucks.''