Bigg Boss ex-winner Gautam Gulati exposed Simba Nagpal's secret letter

Salman Khan in Bigg Boss 15

Umar Riaz and Simba Nagpal argue with each other

Contestants in Bigg Boss 15 house

Umar abuses Simba

See how Simba is fighting

Simba Nagpal and Umar Riaz fight

Bigg Boss 15 Umar Riaz loses his temper

Simba Nagpal wrote mean comments about the contestants of Bigg Boss house