Kendall Jenner vs. Selena Gomez Beef, Justin Bieber's Ex-Girlfriend Betrayed & 'Jealous' Of Secret Hook-Up? Fake 'Two-Faced & Skin-Crawling' Diss

Selena Gomez's relationship with pop megastar Justin Bieber is now a thing of the past. But still, the "Come & Get It" songstress apparently gets rather jealous when another girl tries romancing her ex-beau! Especially when that chick is stunning model, Kendall Jenner...

Although the 19-year-old "Keeping Up With The Kardashians" starlet is not exclusively dating the Biebs, rumors suggest that the two Hollywood youngsters still "hook-up" on the regular.

Not only does 22-year-old Gomez feel "betrayed" that her former friend would do this, but she strongly believes that Jenner is a "two-faced" liar. And the fact that Bieber continuously falls for Jenner's sexual temptations really gets on the "Stars Dance" beauty's nerves!

A supposed insider tells the popular gossip webloid HollywoodLife.com:

"Selena says it makes her skin crawl just thinking about how two faced Kendall is. The whole situation is super twisted. Selena knows Kendall and Justin hooked up behind her back because one of his really close friends told her. Selena blames Justin because he was the one cheating but she thinks Kendall is just as bad because she lied about it and acted like her friend."

Jealous, or does Gomez actually have a good point? Maybe she's still just hurting, because Jenner initially lied about flirting with Bieber. Gomez had to learn the truth from other close gal pals:

"Kendall is super charming when she wants to be, and Selena got sucked in by her," another snitch reveals. "Selena wanted to believe Kendall, so she did for a little while. But she knows they hooked up - a bunch of people have told her, and these are people that saw it go down with their own eyes." 

The first source continues:

"Selena tried to fool herself for a long time because she's friends with so many of Kendall's friends... She didn't want to make drama and make it awkward for everyone. Selena's embarrassed by how much drama there's been because of her and Justin she knows people make fun of her for it so she tries really hard to downplay it." 

Do MstarsNews readers EVER see Jelena getting back together, despite the drama?

Well, it doesn't look like the former Nickelodeon sweetheart will rekindle her relationship with Kim Kardashian's gorgeous younger sis anytime soon...