They started out as friends, then Kailyn reportedly got mad at Jenelle for failing to pay her back after she bailed her out of jail, and it's been pretty shaky ever since.
Kailyn has even posted some cryptic tweets that many think were aimed at her famous frenemy, with the most recent criticizing people who over share on social media, which Jenelle is notorious for doing.
After Jenelle posted some recent drama, and shared her Sulia posts with personal info about the other Teen Mom girls, Kailyn tweeted, "Some people put way too much on twitter and don't focus on REAL LIFE."
Kailyn's husband, Javi Marroquin, however, is a little less discreet about his frustration with Jenelle.
When Jenelle posted a link to one of her Sulia posts that contained a picture of Kailyn's growing baby bump, Javi was furious.
"Some things I want to stay between friends and family not for your stupid Sulia links," he tweeted.
He then replied "exactly" when a fan replied with, "That girl needs to stop!! I would rather have heard this stuff from Kail or you. She's posting it like its her business to tell."
Do you think Jenelle sold Kailyn out by posting her personal stuff online?