Is Justin Bieber 'non-stop texting' Selena Gomez after split?

Everyone knows the rule: Do. Not. Text. The. Ex. But it seems Justin Bieber has ignored the rules of dating by messaging Selena Gomez non-stop since the pair's split.

While partying it up at the Warner Music Group's Grammys after-party on Sunday night, Selena was overheard taking a dig at her ex, revealing that the Biebs is "always texting" her!

The 20-year-old Love Me Like A Love Song singer joined the likes of Katy Perry and Alfredo Flores at notorious celeb hangout the Chateau Marmont, and was spotted telling friends that JB's attempts to woo her back have failed.

"He even invited her to tour with him, go on vacation and everything, but she said no 100 times," an insider told HollywoodLife. "She's bored [of him]. She is dying to move on from him and wants to grow on her own as not just his girlfriend."

While she may have had a sneaky rant about her former boyfie, Selena's best friend and Spring Breakers co-star Vanessa Hudgens revealed she's doing just fine since the split.

"Selena is one of my best friends, I love her to death. She's doing great [post-Justin.]"

So how's Justin feeling about all of this?

"There's so many rumours. People say I call Selena every day and she won't pick up the phone or I'm chasing her down, and these are all fake stories," he told Rolling Stone magazine.

"I don't go on blogs or anything like that. I hear things. People tell me if something happens on the internet. It gets back to me, definitely."

So who are we believing? Justin or Selena? Spill in the comments below...