Tyga received backlash online for using the German-Pakistani model, Amina, instead of a Jamaican woman in his music video.
However, the two were spotted again, probably for the last time.
The pair got engaged in December 2012, but later split in 2014.
Kylie never confirmed any falling out between her and Pia either.
Jenner, who boasts more than 280 million followers on Instagram, initially received pushback for posting footage from the festival showing an ambulance on-site.
In 2013, a 16-year-old Kylie introduced 17-year-old Pia to her fans via Snapchat and Instagram.