Nina Dobrev is having a hard time now that her engagement to Shaun White has been called off! As Perezcious readers know, fans were shocked when the longtime couple called things off earlier this month. While some sources are trying to claim they just grew apart, it really seems like something s**tty happened! Nina's even fanning the flames of rumors that the former snowboarder cheated! Yikes! That would explain why they were posting loved-up pics two days before she appeared without her engagement ring and shortly before the split was announced! Whatever happened, it happened fast! Related: P...