Kendall Jenner and Devin Booker are dunzo -- the model and NBA superstar reportedly split up recently ... and it's all due to their hectic schedules.
KJ and D-Book first went public with their love on Valentine's Day in 2021 ... but as TMZ Sports previously reported, they became an item after spending a ton of time quarantining together in 2020.
Aside from a brief breakup, they held strong for well over two years .