Some sources claim that boys came between the girls. Some say they were jealous of the other’s career path. Whatever the reason it’s true that the two aren’t BFFs like they used to be. Instead, they’re insulting each other on Instagram and in interviews.

Fans watched as 14-year-old Kendall told Kris and Caitlyn Jenner that she seriously wanted to pursue a modeling career. She had even put together a portfolio of pictures as modeling had been her dream since she was 9. It was a sweet moment except for when Kylie stormed out of the room and had a mini breakdown from pure jealousy. Maybe, that’s when she got the idea for Kylie Cosmetics?

Kendall’s first New York Fashion Week was also one of the first times that she felt cooler than Kylie. The older Jenner admitted that in high school she used to cry alone in her room because she didn’t have as many friends as her lil' sis. Things changed when Kendall became a model and stole one of Kylie’s BFFs, fellow model Hailey Baldwin. How did her sister feel about it? "Kylie was mad — at least at first,” Kendall told Elle.

As if the big sis couldn’t just be content with stealing her friends, Kendall also bragged about her cool new posse. “It’s crazy because I really never thought that I would have more friends than Kylie, not that that’s ever a competition or should be anything we’d … I don’t want that to come off weird, but again, she’s so happy with the life she’s living,” the model revealed to Elle.

On an episode of Life With Kylie, Kylie made an admission that led many fans to believe that she didn’t really like big sis Kendall. “I don’t think we’d be friends if we weren’t sisters,” she confessed. “We have different opinions. We do everything differently.”

Fans noticed that Kendall was the only one out of the Kardashian/Jenner clan to “forget” to congratulate her lil' sis on being a mom on Instagram. She also wasn’t there by her sister’s side when she gave birth. Ouch!

So, just how did Kendall feel about Kylie’s birth? Well, she wasn’t entirely happy that’s for sure. In an interview with Lana Del Rey for Elle, the supermodel said, "It’s obviously a bit weird that your little sister is having a baby before you. I didn’t expect it to happen like this. But it’s beautiful." On the bright side, Stormi brought them back together. "We’ve always been very close, but we would butt heads all the time. This has made her a bit more loving toward me."

When rumors spread that Travis Scott dated Kendall before settling down with the youngest Jenner Kylie clapped back at a fan on Twitter: “U just believe anything don’t u” with a face palm emoji.

A source recently came out and said that Kylie knows just how well she’s doing with her career and likes to show off in front of her big sis. “Kylie really rubs it in, and it’s been a big issue lately because Kendall’s on the ascendency with her modeling. And that’s gotten Kylie looking over her shoulder.”

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