Could cheating be behind the split of the year? While neither Justin Bieber nor Selena Gomez have confirmed their breakup, more details about the messy end of their relationship are emerging, and it's not that pretty.

Initial reports of the split pinned the blame on scheduling issues, but it's starting to look like there was more at play than that -- and that the couple's issues go a lot deeper than just different time zones.

A source told PEOPLE, "She broke up with him about a week ago. With them being apart so much it got complicated," the source added. "She had some trust issues. It's not easy, but the relationship needed to end." The fact that Gomez had trust issues with a man who appeared, at least in public, to worship the ground she walks on, doesn't bode well for a reunion. However, some pals think it may still happen -- despite the fact that Biebs was flirting up a storm with Victoria's Secret models this week.

Us Weekly also remarked on Gomez's "trust issues" with Biebs, but also said it may not really be the end. "They are [young] ... it changes from day to day," Us' source spilled. "Right now it is a break and tomorrow it could be back on knowing them ... it's hard to say how they will end up. Maybe she feels more serious about it this time. We'll see."

The split has gone from what was likely once private (and kept under wraps until Biebs' Oprah interview) to a social media maelstrom of drama. Bieber reportedly deleted Gomez from his Instagram account, while Gomez was both the author and subject of passive aggressive tweets directed at Bieber. While it may seem unprofessional on both their parts, the duo were perfectly comfortable being public when things were rosy.

Some fans are speculating that the pair may have just been on a "break," but that Gomez got jealous when she saw Bieber palling around with lingerie model Barbara Palvin. Others  believe (see what we did there?) that Gomez dumped Bieber on Halloween but agreed to keep it quiet until after his interview with Oprah -- in which he gushed over how much he adores her -- aired, and that when she saw Bieber and Palvin together she felt like she was being made to look foolish.

Whatever went down, there's a war a-brewin' between Beliebers and Selenators. Here's hoping Jelena wasn't one of the casualties.

Watch Justin Bieber Backstage at the Victoria's Secret Fashion Show