It's not the first time Kylie has had her suspicions about Travis.
In March this year, Kylie accused Travis of cheating on her when she found something that seemed questionable.
Kylie later revealed that the accusations came from when she found "evidence" on his phone.
At the time, the rapper postponed his AstroWorld concert in Buffalo because of a 'sickness', staying home with Kylie to fix things.
The biggest sign that things have definitely been off for the couple is not only that he didn't accompany her to Justin and Hailey Bieber's wedding on Monday, but that he hasn't appeared on her socials since September 11.
Hopefully, things aren't completely over between the young parents.
"Kylie and Travis aren't officially calling it quits on their relationship, but are taking space apart!" the source continued to E! News.
According to a different TMZ insider, Kylie has been trying her hardest to make things between her and Travis work for quite a while now, but a few weeks ago they both agreed to take some space.