Even though Adrienne Bailon and Rob Kardashian called it quits years ago -- "The Real" talk show star is getting real candid about what happened!

The 29-year-old's kept one detail of the breakup a secret, that is, until now -- remember that letter Adrienne's "boyfriend" emailed to Rob which he shared on "Keeping Up With The Kardashians"?

Check out the video below to find out who really wrote the email and why!

That's right -- Rob was acting too obsessive after Adrienne ended things (when she found out he cheated on her) that she had to create a fake boyfriend to get the reality star to leave her alone!

You'd think he'd get the point when Bailon stopped returning his calls, texts and emails. Not a good look, Rob.

Just a few weeks ago, Adrienne shared her regret over getting Rob's last name tattooed on her backside.

What do you think of Adrienne breakup letter? Tell toofab in the comment section below!

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