Kylie & Tyga: Busy Schedules Pulled Them Apart

Kylie and Tyga could not co-exist because their relationship became an unrelenting test of who was more important ... at least that's the way Tyga sees it.

Sources connected with Tyga tell us, he was battling Kylie almost daily over who should kowtow to who when there was a scheduling conflict. They were fighting over which events they'd attend together, which required one of them to scrap their plans.

Tyga is telling friends the Kardashians fueled the conflict because Kylie would complain about him and the family would stoke the coals by telling her that her career was far more important than his.

Tyga's people say this did not come to a head Thursday ... it's been brewing for weeks.