Kylie Jenner has found a new reason to be mad at Tyga and be scared of Blac Chyna.

According to reports, the 18-year-old is furious with her boyfriend for running to his ex every time they are having problems in their relationship. She believes Chyna will write a tell-all book about them based on all the information Tyga has been feeding her with.

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"Kylie thinks Blac’s an opportunist and it upsets her that Tyga runs to his ex when they’re having problems, telling her everything that’s going in their relationship. For all Kylie knows, Blac could be taking all that information and plotting to write a book, exposing what goes on behind closed doors with Kylie and Tyga. She doesn’t trust Blac. She feels that woman has some sort of spell over Tyga, especially since they’ve had a child together,” a source tells Hollywood Life.

Well, given the fact that Chyna has previously taken every opportunity to blast Kylie publicly and likewise,  we wouldn’t put it past Tyga’s ex to write a tell-all book about him and his teenage girlfriend and that also goes to Kylie. And to make matters worse, "Kylie is afraid Tyga may eventually cheat on her with Blac", says the source.

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“Kylie also feels Tyga has the propensity to get weak around her and it would break Kylie’s heart into pieces if he cheated on her with Blac. She wants there to be little to no communication between those two. And whenever Tyga has to drop off King at Blac’s house, Kylie will be right there,” our source adds.

When you snatch someone's boyfriend, this is the type of fear you have!