Rumors are circulating that Blac Chyna was the true cause of Kylie Jenner and Tyga's split. Blac Chyna is Tyga's ex and they also have a baby together. Now that Chyna is marrying Kylie's brother Rob AND expecting a child, things started to get weird for Kylie. An insider told People magazine, ?She almost felt like she was in an incestuous relationship.? It is true that there was tension between the two couples but Kylie and Tyga also had their own problems, having broken up once before Rob and Blac Chyna started dating.