Justin Bieber and Selena Gomez Split

All good things must come to an end and after almost two years together, Justin Bieber and Selena Gomez have called it quits.

Reportedly, the young power-couple split on Halloween. A source tells Us Weekly, "Selena broke up with Justin about a week ago. It's been a really challenging experience over the last year because of their crazy schedules. Selena definitely had some major trust issues with Justin."

A rep for the Biebs refrained from commenting. However, an insider confides, "They are [young] . . . it changes from day to day. 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."

Though it may be difficult to get over a break-up, Justin has plenty of things going to keep his mind off Selena. His Believe tour is currently making its way through North America. On Friday, he tweeted, "Today the #BELIEVEtour hits New Jersey and I am proud that we will donate a portion of ALL tix sold to Hurricane Sandy Relief. #GIVEBACK."