The reality star was answering fans assumptions about her on her YouTube channel when she dropped the cheating bombshell!
"Did you cheat on Javi first or did he cheat first while you guys were married?" a fan asked Kail.
"So nobody cheated," she admitted.
"Unless you would consider us being with other people after we filed for divorce cheating," she further explained. "You did see on Teen Mom 2 where he said I cheated on him...I already filed for divorce. He already lied twice prior to me filing saying that he filed."
"To me...if I filed and we're both with other people...it's not cheating. Take it or leave it," she added.
"I don't really care! I didn't cheat on him...that's how I feel," she concluded.
Kailyn and Javi were married for two years before she filed in December 2015.
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In October 2016, their divorce was finalized and they agreed to sharing 50/50 custody of their son, Lincoln.
Since their split, their co-parenting ups and downs have been captured for Teen Mom 2 viewers.
After their split, Kailyn welcomed a son, Lux Russell, with her ex-boyfriend, Chris Lopez.
Javi went on to date their co-star, Briana DeJesus, for a few months.
He is now engaged to Lauren Comeau. The two welcomed a baby boy, Eli, in November 2018.
What do you think of Kail putting an end to the cheating rumors? Let us know your thoughts!