Justin Bieber: How Selena Gomez Discovered His Affair With Kendall Jenner

Secrets never stay hidden forever. Justin Bieber and Kendall Jenner may have thought they were being sneaky when they were hooking up behind Selena Gomez's back, but the 'Heart Wants What It Wants' singer knew about their affair all along. Find out how! Selena Gomez, 22, never needed a private investigator. She actually found out about Kendall Jenner, 19, and Justin Bieber's, 21, affair with the help of a close friend!

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Kendall Jenner & Justin Bieber Affair
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Kendall Jenner & Justin Bieber Affair: How Selena Gomez Discovered The Cheating

“Selena knows Kendall and Justin hooked up behind her back because one of his really, really close friends told her,” a source tells HollywoodLife.com EXCLUSIVELY.

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We’re surprised to hear that Justin’s close friend told Selena about his affair with Kendall, but we’re just happy someone was honest with her. Because her frenemy Kendall Jenner played her for a fool.

“Kendall is super charming when she wants to be, and Selena got sucked in by her. 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. One of Justin’s best friends told Selena that he and Kendall have been hooking up since they all went to Coachella last year. Selena believes him one hundred percent,” our source adds.

That’s such a shame. Cheating just causes pain for everyone involved.

Selena Gomez & Kendall Jenner: The Details That Went Down Between Their Friendship

After finding out, “Selena sent [Kendall] angry texts and insulted her,” an insider told Life & Style. “She was really mean to Kendall, but who could blame her? She thought she was her friend.”

And it seems like Selena has never gotten over the affair. The pair never even made eye contact at the Met Gala on May 4.

What do YOU think, HollywoodLifers? Who should Justin date? Vote in our poll and tell us how you feel!

— Chris Rogers