Justin Bieber is devastated over his wife Hailey’s ‘fragile’ mental health, following months of backlash and ‘death threats’ from fans of his ex-girlfriend Selena Gomez. After suffering intense scrutiny for allegedly throwing shade at the Wolves singer, 30, on Instagram, the 26-year-old model recently opened up about going through a ‘hard time’ with all the negativity online. In the wake …