Kylie has been experiencing trust issues since Tristam and Jordyn's cheating scandal came to light. Only one week after the news broke that her best friend hooked up with sister Khloé Kardashian's then-boyfriend, Jenner was blaming her own partner of being unfaithful.
Travis strongly denied the claims to PEOPLE.
"Kylie had a rough week," the source says. "She is still devastated about Jordyn and had an argument with Travis after she checked his phone and saw something she didn't like."
However, the source claims, "Travis says he didn't cheat."
So how are the pair dealing now that the accusations are out there? "Kylie was upset at first," she "seems better" now.
"She isn't breaking up with him," the source continues.
Only a few hours after Travis announced he would be rescheduling his Buffalo performance due to illness, TMZ had reported that Kylie's cheating accusations are what prompted him to cancel the show.
Travis remained in Los Angeles when the couple got into an argument.
A rep for Travis also denied to PEOPLE that he and Kylie were fighting about cheating and that he canceled his show for that reason.
Kylie's rep had no comment.
Watch below... Watch below... Travis Scott says he and Kylie Jenner will get married 'soon':