The world of celebrities has many wild relationships. But few of them are wilder than Selena Gomez and Justin Bieber.

No one was quite as passionate as these two. No relationship hit the bricks quite like theirs. And for 10 years, no one kept going on-again, off-again like these two.

But how did their relationship start? How did it end? And what are the clues hidden inside Gomez’s latest lyrics? We’ve got the full scoop and hottest goss on lock!

5From Serious to Seriously Over

This relationship burned brightly but soon burned out. In fact, we went from heavy rumors that the two were going to get married in September 2012 to an official confirmation that things were over two months later. (At this point, Justin was 18 and Selena was 20.) US Weekly reported that Selena broke off the relationship due to their conflicting schedules and major trust issues with Justin.

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Still, things looked pretty amicable, and it appeared that all’s well that ends well. However, this whirlwind romance was just getting started.