Late Thursday afternoon, TMZ reported that the Keeping Up with the Kardashians star, 21, had accused her 26-year-old rapper boyfriend of cheating on Wednesday, which prompted Scott to cancel his Buffalo, New York, show and remain in Los Angeles, where the couple got into an argument.

Now, a rep for Scott is strongly denying to PEOPLE that he was unfaithful and that he and Jenner had a fight about cheating.

A rep for Jenner had no comment.

The TMZ report came hours after Scott announced on Twitter Thursday that he had both canceled and rescheduled his concert due to illness.

“Buffalo I’m so sorry I can’t perform tonight. I’m under the weather and it f—ing sucks!” tweeted Scott, who has been dating Jenner since April 2017.

“Can’t pull up without full rage,” he continued. “Show rescheduled to March 10 all tix are valid. See u soon.”

The allegation comes at a trying time for Jenner, who shares 1-year-old daughter Stormi Webster with Scott.

Last week, the Kylie Cosmetics founder learned that her best friend Jordyn Woods had allegedly been unfaithful with older sister Khloé Kardashian‘s boyfriend Tristan Thompson.

Since the alleged incident, “the Kardashians are feeling 100 percent done with Jordyn,” a source told PEOPLE.

Jenner has since unfollowed Thompson on Instagram; however, Jenner still follows the model.

While the mother of one has been hurt by the scandal, one source told PEOPLE that “it’s much more difficult” for the reality star.

“Kylie just can’t make sense of what happened,” the source said. “She still has so many questions for Jordyn. Who knows when Kylie will get over this.”

Although Woods has yet to make a public apology, she is appearing on Jada Pinkett Smith’s Red Table Talk on Facebook Watch on Friday, when she will presumably address the alleged tryst.

“She has basically lost part of her world,” said the source. “She is very, very upset. She always trusted Jordyn with everything.”

The two have been best friends since high school, with Woods moving in with Jenner in recent years (she has since moved out), accompanying her on lavish vacations and helping take care of Jenner’s daughter. Woods and Jenner even got “married” with a commitment ceremony on a trip to Peru together that was chronicled in the season finale of Life of Kylie in September 2017.