Kourtney Kardashian said she is leaving the show because it has become a toxic environment for her and she wants to spend more time with her kids. It honestly seemed like it would be a matter of time because her and Kim have been very physical with each other. Remember that fight where Kourtney knocked Kim's face into a wall and all Khloe was worried about is them not waking up her baby? LMBO! If not, just watch below! I've re-watched it so many times. LOL.