The two were spotted at last week's Met Gala Ball but did not walk the red carpet in each other's company.
Kylie, 18 and the rapper went their separate ways before the ball, and the former was reportedly furious that Tyga decided to attend the event despite their break-up as he was apparently only invited because of her, reported People magazine.
The pair have endured a number of bumps in their relationship before this point, but this "time there is no going back."
Tyga is the ex-boyfriend of model Blac Chyna, who recently got engaged to Kylie's half-brother Rob Kardashian and is pregnant with their first child.