According to some of their closest peeps, a split was definitely coming simply because they were both full of jealousy!
This isn't the first time we've heard about jealousy between the two celebs...Selena was apparently not feeling Justin's friendship with Miley Cyrus!
Selena obviously wasn't too happy either when Justin tweeted a picture with Victoria's Secret model Barbara Palvin last week.
But perhaps that was payback...because months ago a picture of Sel kissing another guy surfaced and allegedly Mr. Bieber wasn't too happy about it!
The photo was of Selena and her Parental Guidance costar, Nat Wolfe, smooching on set in August.
By looking at their outfits, you can see that the pic was obviously taken while they were in character for the film.
Work or not work, the kiss between the two allegedly didn't make The Biebs thrilled at all.
We aren't sure if the pic really made JB jealous, but we don't see how it couldn't! There haven't been any comments from either party about the smooch picture.
Do you think jealousy was the reason for Justin and Selena's split? Let us know!