Larry Busacca/Getty Images for Nickelodeon It may have been a boy band fan's dream come true that One Direction and Big Time Rush once teamed up for a tour, but it wasn't so easy for BTR at the time.

The couple met back in 2012 and began dating three years later. Big Time Rush is back with a music video for their new single, 'Fall.' Big Time Rush is back with new music as they gear up to tour ...