However, Khloe and her siblings - Kourtney, and half-sisters Kendall and Kylie Jenner - and their mother Kris Jenner still follow Tristan.
Just hours after Kim addressed Tristan's behaviour during an interview on The Ellen DeGeneres Show which aired on Monday, she made the decision to publicly unfollow him on Instagram - with him then returning the favour.
The "Revenge Body" star has been toying with the idea of moving back to LA ever since her daughter's birth, after her relationship with 27-year-old Tristan was put under strain when video footage emerged seemingly showing him getting close to a mystery woman.
"Women are constantly throwing themselves at professional athletes, and it's very easy to stray when teams are on the road", the source said. "Whatever else comes next with Tristan, or really anything, she'll deal with it as it comes, but she will not let anything affect this awesome time with her little girl".
"Poor Khloé", Kim said.
"I don't even know how to describe it". "She's so strong and she's doing the best that she can".
Khloe's reported Mother's Day plans come after she took to her app this week to gush about the "special" holiday.
'So because this is not so private, I think she's just like, "I need a minute to myself". "Lani's been asking to come to his games to cheer him on for the longest time but Tristan always wanted to keep her in the background, until now".
Last month, the 33-year-old reality star gave birth to her first child, a daughter named True.
Shortly after emerged photos of Tristan and Lani at a hotel in NY plus a video of Tristan kissing two women in a club in DC from October. The so-called insider notes, "She is glad he is helping her out with True, but she has also been spending time a lot of alone time reflecting".